Answer:
C. Intrusive rocks cool more slowly, which produces larger crystals
Explanation:
Intrusive rocks are igneous rocks that form beneath the surface. Unlike extrusive rocks (rocks that form above the surface), intrusive rocks cool down more slowly, so this allows crystals more time to grow before they completely cool down and solidify.
The crystals in intrusive rocks are larger than the crystals in extrusive rocks because intrusive rocks cool more slowly.
Explanation:When comparing intrusive rocks to extrusive rocks, you would expect the crystals in intrusive rocks to be larger. This is because intrusive rocks cool more slowly compared to extrusive rocks. The slower cooling rate allows for more time for the crystals to grow, resulting in larger crystal grains in the rock.
Which of the following is not part of the cell theory?
A. Every living thing is composed of cells.
B. Cells come from pre-existing cells.
C. Cells are the basic unit and structure of all living things.
D. Every cell has a nucleus that contains genetic material.
Answer:
The option D) 'Every cell has a nucleus that contains genetic material' is not a part of the cell theory.
Explanation:
The cell theory has three main postulates which are:
All living things are made up of a cell or different cells.All cells arise from pre-existing cells Cells are the basic unit of life.The cell theory does not claim that every cell shall have a nucleus. The prokaryotes lack a nucleus yet still are living things. However, all cells will have genetic material in the form of DNA or RNA.
Would you except to find a muscle tissue in a plant.Why or why not
Answer:
No, you would not expect to find a muscle tissue in a plant.
Explanation:
Why? because muscle tissues are built up of cells that receive and react to signals sent from the brain, though some plants (usually carnivorous or touch sensitive) do have different ways of movement. But again, these methods are *Not* muscle tissues!
Muscle tissue is not found in plants. Plants have different types of specialized tissues such as vascular and ground tissue.
Explanation:Would you expect to find a muscle tissue in a plant? Why or why notNo, you would not expect to find muscle tissue in a plant.
Plant cells are different from animal cells and do not have the specialized structures and proteins required for muscle movement.
Instead of muscle tissue, plants have different types of specialized tissues, such as vascular tissue for transporting water and nutrients, and ground tissue for storage and support.
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Cells try to maintain three major conditions. One is your body temperature. What are the other two?
Cells try to maintain three major conditions which include temperature, pH level and solute concentration.
Organisms need to maintain steady conditions (i.e., a homeostasis state) inside their cells.The pH level is fundamental for carrying out many cellular processes (e.g., enzymatic degradation).Solute concentration is also fundamentally during many metabolic processes (e.g., transport of substances inside the cell).In conclusion, cells try to maintain three major conditions which include temperature, pH level and solute concentration.
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What might happen if the gametes of a species had
the same number of chromosomes as the species'
body cells?
Answer:
The chromosome number will not be constant and the person would die.
Explanation:
During gamete formation, half of the chromosomes arise from one parent and the other half from the other parent. This is possible due to the process of meiosis.
If during gamete formation, the number of chromosome does not get reduced, then after fertilization the gamete will have double the number of chromosomes as compared to the parents. Hence, the chromosome number of the person will not remain constant and he/she would die.
The chromosome number will not be constant and the person would die.
Meiosis is the type of cell division that occurs during reproduction. In
this type of division, the result is the formation of two unique daughter
cells.
Mitosis on the other hand is the cell division concerned with growth and
replacement of worn out tissues in the body.
In instances where the gametes of a species had the same number of
chromosomes as the species' body cells, the species formed will have a
chromosome number which isn't constant which may result in death due to
issues occurring during replication.
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All the individuals of a species that live together in one place at the same time
Answer:
All the individuals of a species that live together in one place at the same time is called as population.
Explanation:
When organisms of same group or species live in a particular area they are defined as population. Along with living in a particular area the species should also have the 'capability of interbreeding' in order to be called as population. Demography is a social science that deals with the 'statistical study of population'.A term 'sex population' is often visualized in 'population genetics', it refers to a organisms group in which a 'pair of members' can breed together.Answer:
The answer is population (this question was on USATestprep)
Explanation:
Which water conservation strategy is used when a household installs a dual flush toilet?
1.) reusing and recycling
2.) eliminating losses
3.) preventing pollution
4.) limiting consumption
Final answer:
A household installing a dual flush toilet uses the strategy of limiting consumption to conserve water by allowing a choice between full and reduced flush options, directly reducing the volume of water used per flush. Option 4.
Explanation:
The water conservation strategy that is used when a household installs a dual flush toilet is limiting consumption. Dual flush toilets are designed to use different amounts of water for liquid waste and solid waste, which reduces the overall water usage. By having two options, one for a full flush and one for a reduced flush, dual flush toilets encourage households to use only the amount of water necessary for the type of waste being disposed of. This is a direct approach to reduce water consumption in residential areas, where toilet flushing is typically the largest indoor use of water.
In addition to this strategy, there are many other ways to reuse resources effectively. For example, using gray water for gardening, collecting rainwater in rain barrels, and installing water-efficient fixtures are all practical approaches toward water conservation. Furthermore, reusing and recycling materials and reducing waste production overall also contribute to conserving our natural resources and minimizing the environmental impact.
Please help I can’t figure this out
Select all of the things that are true about photosynthesis and respiration
(Check all that apply)
1. Aerobic respiration in an efficient way to covert glucose into ATP
2. Only plants are able to use photosynthesis
3. Chlorophyll is why we see so many different colors
4. Plants do not use mitochondria because they do not need to use respiration
5. Water and carbon dioxide are reactants in photosynthesis
6. Cells can still “burn” glucose to realize energy without oxygen
7. Carbon dioxide comes out of photosynthesis
8. Respiration happens in mitochondria
9. Photosynthesis held plants make sugar
Answer:
Photosynthesis is the process in which cells use carbon dioxide and water to make glucose in the presence of sunlight.
Respiration is the process in which glucose molecules are utilized to release energy in the form of ATP.
Explanation:
Ans1- Respiration in cells occurs in mitochondria. Cells gain energy in the form of ATP. Conversion of glucose in the form of ATP is known as cellular respiration.
Cellular respiration can take place either in presence of oxygen(aerobic respiration) or in absence of oxygen(anaerobic respiration ).
Before entering into cellular respiration glucose molecule has to be converted into pyruvic acid. This process in known as GLYCOLYSIS.
Anaerobic respiration occurs in mitochondria when oxygen is not present. It is known as fermentation.It is not effective process to produce ATP from glucose as in this process only 4 ATP can be released.
Aerobic respiration occurs in mitochondria in presence of oxygen. This is effective pathway to gain ATP as it releases 36 ATP from 1 glucose molecule.
Ans2- All cells which has photosynthetic pigments are able to use photosynthesis. Example- Blue green algae, cynobacteria etc.
Ans3- We can see different shades of green colors of plants and leaves because of different types of chlorophyll present in plant. Chlorophyll are of 6 types in plant. Their types are based on the lights they absorb. Two main types of chlorophylls are chl a and chl b.
Ans4- Both plant and animal cells have mitochondria. In plant also they need energy. To get ATP from breakdown of glucose respiration is occur in plant also.
Ans5-In photosynthesis glucose is formed from water and carbon di oxide. 6 carbon dioxide and 6 molecules of water are used to make 1 molecule of glucose. Water and carbon di oxide are reactant in this process.
Ans6 - Cells without oxygen can burn glucose to release energy. This process is known as Anerobic respiration/ fermentation. But the outcome of energy is lower than aerobic respiration. ( ANS1)
Ans7- In the process of photosynthesis reactants are water and carbon di oxide. Oxygen produced released in the form of gas along with carbon di oxide.
Ans8- The enzymatic reaction of respiration occurs in mitochondria. Krebs cycle occurs in the matrix of mitochondria.( ETC electron transport chain) to release ATP occurs in cristae of inner membrane of mitochondria.
Ans9- Plants make glucose through photosynthesis . In presence of sunlight plants use carbon dioxide and water to make sugar.
14. Label the diagram using terms from the following list:
• memory cell
. B cell
. pathogen
• antibody
• antigen
Answ
Left - antigen
Top Right - antibody
Bottom right - B cell
Explanation:
Antibodies (top right label) are Y shaped proteins involved in the detection of pathogens. They specifically detect molecules associated with pathogens called antigens (left).
Antibodies are produced by B cells (bottom right) which are a specialised class of immune cells that make up part of the adaptive immune system. B cells are often referred to as white blood cells.
which statement about sexual reproduction in flowering plants is true
Answer:
D) Asexual reproduction produces offspring that are genetically identical to the parent.
Explanation:
I am honestly not quite sure of this answer, but I was trying to read up on the topic and this is the answer I'm most confident in. It would make sense that the offspring are genetically identical to the parent because they would have no where else to get their genes/mix to form new ones. I really hope this helps!
Describe the characteristics of sound energy.
Explanation:
Sound travels in the form of a wave. Waves are characterized by three basic quantities. They are frequency, speed, and amplitude. Two of the main characteristics of sound are pitch and loudness, which in turn are determined by the frequency and amplitude of the wave, respectively.
Final answer:
Sound energy is a type of wave energy characterized by pitch, loudness, and tone. Pitch refers to the perceived frequency of a sound wave, loudness refers to the amplitude of the wave, and tone refers to the quality or timbre of the sound.
Explanation:
Sound energy is a type of wave energy that is created by vibrations and is transmitted through a medium such as air, water, or solid objects. It is characterized by several properties:
Pitch: The perceived frequency of a sound wave, which determines whether a sound is high or low.Loudness: The amplitude of a sound wave, which determines how soft or loud a sound is.Tone: The quality or timbre of a sound, which is determined by the combination of different frequencies present in the sound wave.For example, a high-pitched sound has a high frequency, while a low-pitched sound has a low frequency. Similarly, a loud sound has a large amplitude, while a soft sound has a small amplitude. The tone of a sound can vary depending on the specific combination of frequencies present.
Iron is needed by the body to make_____
Answer:
Hi there!
the correct answer to this question is: Hemoglobin
Explanation:
Iron is needed by the body to make hemoglobin.
Answer:
Iron is needed by the body for optimal functions.
Explanation:
Iron has various functions in the body. A well known function is its presence in the muscle as haemoglobin which helps transport blood. It is also present in the muscle (myoglobin); and in molecules (cytochromes)
Why is the pairing of nitrogen bases key to understanding how DNA replication occurs?
The DNA replication occurs by preparing a new strand of DNA that is based on the template strand only. So understanding the nitrogen base pairing is very essential for understanding DNA replication.
Explanation:DNA replication occurs prior to any type of cell division in all organisms. In case of humans, the DNA that is to be replicated needs to be de winded by means of decondensation of chromosomes into chromatin fibres and then to DNA fibres. Then there are enzymes like helicase and gyrase which helps in breaking the hydrogen bonds between two strands of DNA and to open it up for enzymes to get attached.
Then the enzyme DNA dependent DNA polymerase works on both the strands of DNA where it reads the mother DNA strand as a template and then brings deoxyribonucleotides complementary to the template strand and then polymerises it with the previous nucleotide to form a new DNA strand. Thus two DNA strands are produced which are again complementary to each other, leading to the production of a new daughter DNA. So, understanding the complementary base pairing is very essential to understand the DNA replication.
the diffusion of water across a selective permeable membrane is called what
Answer:
The diffusion of water across a selective permeable membrane is called osmosis.
Explanation:
Osmosis can be described as the movement of water molecules from an area of higher concentration to an area of lower concentration through a selectively permeable membrane. As the water molecules tend to move along the concentration gradient, hence the process of osmosis is a type of passive transport. Very little or no energy will be required for the process of osmosis to occur.
In contrast, during the process of active transport, molecules move against a concentration gradient and hence require energy.
The process of water diffusion across a selectively permeable membrane is known as osmosis. It aids in the movement of water from a region with low solute concentration to a region with higher solute concentration, helping maintain balance inside the cells.
Explanation:The diffusion of water across a selective permeable membrane is known as Osmosis. In biological terms, osmosis is an essential process for the survival of organisms. It helps in the movement of water from an area of low solute concentration to an area of high solute concentration. This movement maintains the balance of water and solutes inside the cells of the organism.
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Human __helps examine the impact of population growth on the
environment.
Answer:
]
Explanation:
"The impact of so many humans on the environment takes two major forms: consumption of resources such as land, food, water, air, fossil fuels and minerals. waste products as a result of consumption such as air and water pollutants, toxic materials and greenhouse gases."
Answer:
Geography
Explanation:
12. What molecule is made by RNA polymerase?
Answer:
DNA
Explanation:
RNA polymerase synthesizes RNA by following a strand of DNA. RNA polymerase is an enzyme that is responsible for copying a DNA sequence into an RNA sequence, during the process of transcription.
Which of these would you be most likely to find in a swamp?
O
A. Sand dune
B. Cypress tree
O
O
C. Drought-tolerant shrub
O
D. Pink-flowering goat's foot
Answer:
B
Explanation:
Answer:
B. Cypress trees
Name 5 roles of proteins
1. Provide structure
2. Causes Biochemical Reactions
3. balances fluids
4. transports and stores nutrients
5. provides energy
Will make brainilest answer!!!
If you went 200 miles out to sea off the Oregon coast and drilled into the sea floor, you would be drilling into ______________.
A) continental crust
B) oceanic crust
Answer:
Oceanic crust
Explanation:
I would assume that with the contenential crust having position mostly on the contenential areas, oceanic crust would be the right answer ;200 miles off.
Chemical triggers and messengers for many
processes within cells that cause most of the
differences you can see among organisms are
called
Answer:
Proteins
Explanation:
Proteins are macromolecules composed of amino acids that perform multiple and varied functions in the body. Proteins that act as chemical messengers are present in the form of hormones, ligands, neurotransmitters, regulatory proteins and enzymes.
Genes code for proteins that in turn control all life processes. The differences we witness in individuals such as weight, height, skin color, intelligence etc are all due to our unique genetic code and a unique combination of proteins that these genes encode. Furthermore, the levels to which our genetic code is expressed is also regulated at the molecular level by proteins.
A scientist is studying a volcano. She claims
that the lava that comes out of the volcano is a
liquid. She wants to make an argument to
support her claim. What question should she
ask to help her collect evidence for her
argument?
A. Does the lava have a definite volume?
B. Is the lava made of particles that move
around?
C. Does the lava have a definite volume and
does it flow freely?
D. Does the lava have a definite volume and
particles that are very far apart?
The question which the scientist should ask to help collect evidence for the argument is "Does the lava have a definite volume and does it flow freely?". Thus, the correct option is C.
What is Lava?When the magma flows or erupts onto Earth's surface, it is called as the lava. When lava erupts from the volcano it is made up of a slush of crystals, liquid, and bubbles. The liquid rocks and magma "freezes" to form volcanic glass. Chemically, this lava is made up of the elements like silicon, oxygen, aluminum, iron, magnesium, calcium, sodium, potassium, phosphorus, and titanium with some other elements in very small concentrations.
The lava can be claimed to be liquid by the argument which questions "Does the lava have a definite volume and does it flow freely" as liquids have a definite volume and flows freely in any container or space.
Therefore, the correct option is C.
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(01.04 LC)
Mason is preparing to present the results of a study he did to track the germination rates of bean seeds treated with growth hormones. He wants to show the
different rates of growth as they progressed over time. Which of the following would be best for conveying growth rates over time?
Simple table
Answer:
A line chat would be the best
Hello. This question is incomplete. The full question is:
"Mason is preparing to present the results of a study he did to track the germination rates of bean seeds treated with growth hormones. He wants to show the different rates of growth as they progressed over time. Which of the following would be best for conveying growth rates over time? a)Simple table b)Line chart c)Venn diagram d)Pie chart "
Answer:
b)Line chart
Explanation:
Line charts are the ideal representation to show changes over time. For this reason, if Mason wants to show the different growth rates of bean seeds as they progress over time, he should choose this type of representation.
In summary, we can say that line graphs are composed of the x and y axes. In addition, its composition is determined by the presentation of values related to periods of time, distributed along these axes.
By the end of prophase, each of the following has occurred except ____.
Question 7 options:
tighter coiling of the chromosomes
breaking down of the nuclear envelope
disappearing of the nucleolus
lining up of chromosomes in the cell
Answer:
D) lining up of chromosomes in the cell
Explanation:
Prophase can be described as the first stage of cell division. During this phase, The chromatin material condenses and becomes compact so that the chromosomes become visible. The nuclear envelope disintegrates and the nucleolus disappears. Hence, the choices mentioned in option A, B and C occur by the end of prophase.
Metaphase is the third phase of cell division. During this phase, the chromosomes line themselves in the centre of the cell. Hence, the lining of the chromosome does not occur by the end of prophase. This occurs during the third stage.
1. Scientists often work together in teams to solve
problems. In 2009, an influenza virus emerged from
pigs that went on to infect an estimated 24 percent
of the world human population. How could
biologists from a variety of fields contribute to
studying this widespread disease and developing a
treatment, prevention, or cure?
How is influenza prevented?
The single best way to prevent seasonal flu is to get vaccinated each year, but good health habits like covering your cough and washing your hands often can help stop the spread of germs and prevent respiratory illnesses like the flu. There also are flu antiviral drugs that can be used to treat and prevent flu.
Usually, you'll need nothing more than bed rest and plenty of fluids to treat the flu. But if you have severe infection or are at higher risk for complications, your doctor may prescribe an antiviral medication
Answer:
Biologists from all different fields could work together to contribute to the study of the disease by using the information they already know about the disease and find out what it attacks, and how quickly it spreads. They could find a cure by seeing what kills it and see if using a dead strand of it would prevent a person from getting it, just like an actual flu shot. (Im not sure it's 100% right)
2 Points
Which habitat is known for many species of birds, monkeys, snakes, lizards,
frogs, and insects?
O
A. Tropical rain forest
O
B. Desert
O
C. Grassland
O
D. Boreal forest
SUBMIT
Answer: A
Explanation: It seems like the most logical thing considering monkeys and frogs don't live in the desert.
Hope this helps <3
Answer:
Tropical rain forest
Explanation:
How can you tell that these snapdragon do not follow the pattern of complete dominance
Answer:
Thorough observation and understanding of dominance types
Explanation:
It is very simple to distinguish between traits following complete dominance or incomplete dominance
There can be three cases of dominance
a) Complete dominance - where characteristics of one allele are expressed over and above the characteristics of the other allele
b) Incomplete dominance - Here both the traits are dominant but a blending of the two traits occur for example red and white flower producing pink flower
c) Co-dominance - Here both the traits are dominant but no blending occurs between the two traits occur for example red and white flower producing flower with red and white bands
Based on the above definitions , pattern of complete dominance is followed or not in case of snapdragon can be depicted.
We can tell that snapdragons don't follow complete dominance due to the pink flowers of heterozygotes indicating an incomplete dominance pattern of inheritance, where neither red nor white alleles are completely dominant, resulting in an intermediate phenotype.
Explanation:You can tell that these snapdragons do not follow the pattern of complete dominance because of the presence of an intermediate phenotype in the heterozygote snapdragons. In cases of complete dominance, one allele is completely dominant over the other, and the heterozygote expresses the dominant phenotype. However, in incomplete dominance, the heterozygote expresses a phenotype that is a blend of the two parental phenotypes. For instance, when crossing a snapdragon with red flowers (CRCR) with one that has white flowers (CWCW), the offspring are not red or white but display pink flowers, which indicates a mix of both red and white traits.
This phenomenon contradicts the historical view that inheritance always results in dominant and recessive traits, as was first demonstrated by Gregor Mendel in his pea plant experiments. Incomplete dominance, like in the example of the snapdragon flowers, shows that one gene for flower color can have alleles for red and white, neither of which is completely dominant. Therefore, the resulting pink flowers of the heterozygotes (CRCW) clearly show the intermediate inheritance pattern.
a testable explanation of a situation is called
Answer:
A hypothesis.
Explanation:
A hypothesis is a tentative answer to a scientific question. A testable hypothesis is a hypothesis that can be proved or disproved as a result of testing, data collection, or experience. Only testable hypotheses can be used to conceive and perform an experiment using the scientific method.
Which of the following best describes how crossing over occurs during meiosis?
A. During prophase I, homologous chromosomes are lined up and pulled apart to opposite poles.
B. During prophase II, sister chromatids trade places with each other before
metaphase begins.
C. During prophase I, segments of chromatids are exchanged between homologous chromosomes.
D. During prophase II, chromosomes overlap and sections of each chromosome switch places.
Answer:
The correct option is C) During prophase I, segments of chromatids are exchanged between homologous chromosomes.
Explanation:
Meiosis can be described as a process of cell division which leads to genetic variations. These variations are produced due to crossing over and independent assortment of chromosomes. The number of chromosomes is reduced to half as the parent cells during this type of cell division.
Crossing over occurs between prophase I and metaphase I. During prophase I, segments of chromatids are known to be exchanged between the homologous chromosomes. Hence, option C is correct.
Answer:
B- homologous chromosomes join together to form tetrads during prophase I
Explanation:
name two major types of mutations. what do they have in common? how are they different? give an example of both
Answer & Explanation:
Two major types of mutations are deletions and substitutions
Deletion occurs when the DNA replication machinery misses or removes some nucleotides, meaning some of the sequence is missing from the new DNA. This can be just one nucleotide, a few, or lots of nucleotides.
Substitution occurs when the DNA replication machinery makes the wrong sequence, substituting one or several bases for others.
Both of these mutations can be deleterious, and occur at the level of the individual nucleotide. The effects of each of them greatly depend on the location and size of the mutation.
If a small deletion occurs at a relatively unimportant region, for example a non-coding region, or a part of the coding region that is not essential to the structure or function of a protein, then the deletion might not be too problematic to the cell. On the other hand, if even a small deletion were to affect the active site of an enzyme, a binding site, or destroy a key structural residue, then the protein could not perform its function properly. Depending on the role of the protein, this could be disastrous for the cell. The same principles apply for the substitution. If the substitution replaces important nucleotides for ones that change the amino acid sequence of important sites, then the protein could not perform its function. Alternatively, some regions might be more flexible, and the substitution could be inconsequential. Another way that a substitution might not be too problematic, is if the final amino acid that resulted from the substitution was either the same, or had similar properties, to the initial amino acid that was coded for. For example, if the initial and replacement amino acids were both uncharged, as opposed to if a uncharged residue was replaced with a negatively charged amino acid. Another difference in these mutations is that a deletion can cause a frameshift mutation. Frameshift mutations occur when the "triplet" nature of the genetic code is disrupted, such that the entire sequence is affected. I.e. if you remove one nuclelotide, then everything after that is read differently, as the machinery reads it in threesThis means that the entire protein after the deletion site is incorrect.An example of a deletion mutation that causes a disease is in cystic fibrosis, where there is a deletion in the gene CFTR. The most common mutation, is a deletion of three nucleotides that causes a the loss of the amino acid phenylalanine at residue 508.
An example of a substitution mutation causing a disease is sickle cell anemia, which changes a glutamic acid to a valine in the haemoglobin protein.
Final answer:
The two major types of mutations are germline and somatic mutations, both involving DNA sequence changes but differing in heritability and impact. Germline mutations are inheritable and affect all cells of the offspring, while somatic mutations are not inheritable and only affect certain cells in the individual.
Explanation:
Major Types of Mutations and Their Distinctions
There are two major types of mutations: germline mutations and somatic mutations. Both play crucial roles in biology, but have distinctive characteristics and implications.
Germline Mutations
Germline mutations occur in the sex cells, such as eggs and sperm. These mutations are heritable, meaning they can be passed down to offspring. For example, a mutation in the BRCA gene associated with increased cancer risk is a germline mutation, as it can be inherited from a parent.
Somatic Mutations
Somatic mutations occur in other cells of the body, excluding the sex cells. These mutations are not passed down to offspring but can lead to diseases such as cancer within the individual. An example of a somatic mutation is the acquisition of mutations in the TP53 gene in a single liver cell, leading to liver cancer.
Commonalities and Differences
Both types of mutations involve changes in the DNA sequence. However, germline mutations affect the offspring's entire genome and are heritable, while somatic mutations affect only certain cells in an individual and are not heritable. Understanding the differences between these mutations is crucial for genetics and medical research.
which one of the following types of muscles helps you turn your body upwards?
A. Pronator
B. Abductor
C. Adductor
D. Supinator
Answer:
Adductor
Explanation:
The answer is Adductor.
Final answer:
The supinator muscle is responsible for turning the forearm anteriorly, or upward, which is part of the supination movement where the palm faces forward.
Explanation:
The type of muscle that helps you turn your body upwards by turning the forearm anteriorly is the supinator muscle. This muscle is responsible for supination, which occurs when the palm of the hand is turned to face forward, aligning the radius and ulna in a parallel manner. On the contrary, pronation involves the palm facing backward with the radius crossing over the ulna.
The pronator muscles, such as the pronator teres and the pronator quadratus, facilitate this motion. To clarify the options given, abductors are muscles that move a limb away from the body's midline, such as the supraspinatus muscle that abducts the arm at the shoulder. Adductors bring limbs towards the body's midline, exemplified by the adductor muscles of the thigh.
scientists rarely say theory is proven . they only only say whether the evidence
Answer:
Scientists rarely say that a theory is proven. They will say that whether their the evidence presented supports the theory or not. This is because a scientific theory is subjected to change. Any new evidence found in contradiction to the previous theory will lead to the formation of another theory. Hence, a theory is no proved, it is supported through evidences or experiments.
In contrast, when an evidence is proved it will be subjected to become a scientific law. A scientific law cannot be changed.