Radioactive isotopes in fossils decay at a constant rate. The ratio of radioactive isotope to stable isotope can be examined to estimate the age of the fossil or the rock it was found in. This is an example of _______ dating.
A. relative
B. Precambrian
C. absolute
D. magnetic
Answer:
The correct answer is option C, that is, absolute.
Explanation:
A method of dating in which the chronological age of the rock or the fossil can be predicted based upon the radioactive carbon dating is known as absolute dating. The radioactive carbon refers to the element that dissociates or degrades after the organism's death. The determination of the half-life can be done on the basis of the process of decay that can be associated with the age of proof.
What name is given to the rigid structure, found outside the plasma membrane, that surrounds and supports the bacterial cell?1. capsule2. pili3. cell wall4. flagella5. nucleoid region
Answer:
3
Explanation:
bacteria possess cell wall made of murein
What nerve transmits sound impulses to the brain?
Which of the following is a single-gene trait in humans?
A.widow's peak hairline
B.height
C.intelligence
The idea that viruses originated as genetic material that was able to move within a genome, eventually exiting a cell and entering another is the _______ hypothesis.
A. progressive
B. recessive
C. coevolution
D. regressive
Please help.
Answer:
A. Progressive
Explanation:
Origin of viruses is explained variously. According to one hypothesis, viruses are thought to be originated from mobile genetic elements. This is also called a progressive hypothesis of the origin of viruses.
According to this hypothesis, some sequences from the genomes acquired the ability to move from one locus to another locus of genome. Gradually, these mobile genetic elements acquired the ability to move between different cells and led to the evolution of viruses.
Answer:
A. progressive
Explanation:
Progressive Hypothesis: The DNA and RNA that show up inside viruses originally came from a living cell. This nucleic acid evolved new abilities to infect and replicate.
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What circumstances must be present for enormous balls of hail to grow and then fall to the ground?
Answer:
The size of hailstones usually increases with the intensity of the storm cell from which they spawn. To form hailstones the size of golf balls requires over ten billion supercooled droplets be accumulated, and thus they must remain in the storm cloud for at least 5 to 10 minutes. (Compare this to the one million or so droplets needed to form the typical raindrop.) Therefore, large hail (> 5 cm / 2 inches) forms mostly in super cell thunderstorms which have strong updraft winds.
Explanation:
Scientists use observations and data to form and test
a. theories.
b. constants.
c. hypotheses.
d. conclusions.
Answer:
conclusions
Explanation:
Scientists use observations and data to form and test hypotheses which if supported by the evidence may become a theory.
Option C is correct
What is a hypothesis?A hypothesis is a tentative explanation for a phenomenon. It is a statement that can be tested by observation or experimentation. If the hypothesis is supported by the evidence, it may become a theory.
A theory is a well-supported explanation for a phenomenon. It is a hypothesis that has been repeatedly tested and confirmed. Theories are the foundation of science. They allow us to understand the world around us and to make predictions about future events.
Option C is correct
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Which of the following is an example of a non-falsifiable hypothesis? A. There is a teacup orbiting the Milky Way galaxy. B. There is no life on Mars. C. The human species started in Africa. D. Humans cannot live without the amino acid methionine
The non-falsifiable hypothesis listed above is A. There is a teacup orbiting the Milky Way galaxy.
A non-falsifiable hypothesis is one that cannot be proven to be either right or wrong and there are two main reasons for this:
The hypothesis is based on a subjective premise. For instance, saying football is better than baseball. This is subjective because it depends on the person and so we cannot say for certain which is better or worse.Based on our current technological abilities, it is impossible to prove the hypothesis either wrong or right.We cannot prove that there is a teacup orbiting the Milky Way galaxy because we simply do not have the technological capacity to build a vessel that can go around the Milky Way to research this so it is a non-falsifiable hypothesis.
All the other options can be proven to either be right or wrong because:
we can go to Mars to check if there is any life, we can look at fossils to find out if humans came from Africa and,we can test to see if human cells survive without amino acid methionine.We cannot however, confirm if a teacup is orbiting the Milky Way so this is non-falsifiable.
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Which process can affect the rate of carbon dioxide emissions or other greenhouse gas emissions by changing average temperatures?
A. Axial precession
B. Cloud cover feedback
C. Continental drift
D. Greenhouse gas feedback
Please don't guess the answer, if you know you know it please answer. Thank you
Answer:
Greenhouse gas feedback
Explanation:
Greenhouse gas feedback may be defined as the mechanism of increase or decrease the amount of greenhouse gases in the atmosphere. The feedback mechanism may be positive or negative.
Greenhouse gas feedback can affect the rate of greenhouse gas emissions by itself changing the average temperature. This feedback results in the additional warming in the environment.
Thus, the correct answer is option (D).
Answer:
d
Explanation:
{{FIFTY POINTS}} could someone help me place five birds on a cladogram, and explain why you put them where you did?
Answer:
In the cladogram, I've put the pelican further away from the other birds Because it has a different order that the birds .The other birds are in order "Passeriformes" and the pelican is in order"Pelecaliforms"
(Refer to the attachment)
In constructing a cladogram for five birds, we utilize cladistics to group birds based on shared characteristics and common ancestry.
When placing five birds on a cladogram, one would begin by identifying shared characteristics that define different clades. Cladistics is the method used for this purpose, which sorts organisms into groups called clades based on common ancestry. In constructing a cladogram, we would start with the most recent common ancestor and work our way outwards, placing species that share more recent ancestors closer together on the cladogram.
To exemplify, consider birds A, B, C, D, and E. Let's say birds A and B share a very recent common ancestor indicative of a specific adaptation, such as elongated beaks for accessing deep nectar sources. They would be placed as sister species. Birds C, D, and E might possess another shared trait, such as similar migratory patterns, suggesting that they diverged from a different common ancestor more recently than the split between A/B and C/D/E. Therefore, C, D, and E would be grouped together, with lines spreading out to depict their divergence based on the order in which their unique traits emerged.
The explanations for placing each bird where it is on the cladogram come from a thorough understanding of their evolutionary relationships, informed by morphological, genetic, and behavioral data. In the context of placing reptiles and birds in the same clade, this is based on significant evidence indicating that birds evolved from reptilian ancestors. This is why in phylogenetic classification, birds are included in the same clade as modern reptiles.
Cells have receptors on their surfaces to sense their environment and to communicate with other cells. Viruses use these cell receptors to
Answer:
Enter the host cell.
Explanation:
Viruses attach themselves to the cell surface receptors present on their host cells. Binding of viruses to these receptors is followed by penetration of the host cell.
For example, the flu virus binds to the cell surface receptors located specifically on the surface of cells of the respiratory system. Hence, the cell surface receptors of the host cell are used by viruses to enter the host cell.
Which cells are associated with the humoral and cell-mediated parts of the immune system?
Humoral—B lymphocytes; cell mediated—T lymphocytes
Humoral—B lymphocytes; cell mediated—neutrophils
Humoral—T lymphocytes; cell mediated—neutrophils
Humoral—neutrophils; cell mediated—T lymphocytes
Answer:
B cells and T cells, respectively.
Explanation:
Humoral and cell-mediated immunity are parts of adaptive immunity, which is acquired by an individual in his lifetime due to exposure of pathogens. Cells involved in humoral immunity are B lymphocytes or B cells. These cells form antibodies to fight against infections.
Cells involved in cell-mediated immunity are T lymphocytes or T cells. These cells release various cytokines that activate other immune cells or kill pathogens directly.
Thus, the correct answers are B cells and T cells, respectively.
Answer:
A and C
Explanation:
Not multiple choice.The function of the larger, more typical pinecone is:
to produce pollen
to produce sperm
to produce eggs
to fertilize seeds
Answer:
to produce eggs
Explanation:
The larger pinecone are the female cones of the plant. They are responsible for producing eggs.
The male cones are yellow, formed by numerous scales, with bags full of pollen, the female cones are greenish formed by scales in which there are uncovered eggs.
In their maturation, male cones or catkins release millions of pollen grains to the wind, which are transported by the wind and fall into the female cones, fertilizing the eggs. Fertilized, the female cone closes forming the pinecone, inside which are the pine nuts, the product of the fertilized eggs. At the end of a year or so, the pine cone opens and lets the pine nuts fall, which disperse in the wind until they fall in a suitable place for their germination.
what does the column number of the periodic table tell you about the nonmetal elements ?
A. the number of protons in its outermost shell
B. The number of electrons in its outermost shell
C. the number of outer shells in the atom
D. the number of bonds possible in the outermost shell
OPTION B.
The column number of the periodic table tells you about the number of outer shells in the atom for nonmetal elements.
Explanation:The column number of the periodic table tells you about the number of outer shells in the atom for nonmetal elements. Each column, also known as a group or family, represents the number of valence electrons in the outermost shell. Valence electrons play a key role in determining the chemical properties and reactivity of an element. For example, the nonmetal elements in Group 17 (column 17) called the halogens, have 7 valence electrons and tend to gain one electron to achieve a full outer shell, making them highly reactive.
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Which of these environments will have the highest average temperatures? A. Rural farms B. Suburban centers C. Ocean shorelines D. Urban cities
Answer:
D. Urban cities is a correct answer.
Explanation:
Urban cities have the highest average temperatures because of urban heat island effect makes the air temperature warmer.
An increase in the population and more land usage,modification in the land, decrease in the evaporation directs to expand the area and increase the average temperature which result in the increasing urban heat islands. The urban heat island is an aspect in which the surface temperature gets concentrated in the urban areas and the heat gets stored in the surface of the materials and solar energy gets absorbed and solar radiation is produced, which warmer the air and the higher heat islands increase the average heat temperature in the urban cities.
Thus the Urban cities has the highest average temperature.
Answer:
D. Urban cities
Explanation:
Most people are awake during the day and asleep at night because their____cycles are aligned with the outside world.
circadian cycles (this is basically the body's inner "clock" that tells us when to go to sleep and when to wake up and stay awake)
Hope this helped!
~Just a girl in love with Shawn Mendes
Dna replication occurs in preparation for
Answer:
Dna replication occurs in preparation for production of RNA
Which type of biological macromolecule is a new drug most likely to be?
A. Nucleic Acid
B. Protein
C. Carbohydrate
D. Lipid
What point in this body of water is most likely to have no plants growing
Answer:
Point D
Explanation:
Point D is the point that is most likely to not have any plants growing in it. The reason why this point of the body of water will not have any plants is because of the lack of light. This part of the body of water is dark, with no light penetrating to it. The plants need light to survive, as it is a vital element in the process of photosynthesis. If there isn't any light, the plants can not perform photosynthesis, thus they can not produce their own food, which in turn means that they will not exist in such a place.
Answer: (POINT D )The aphotic zone: places where they aren't getting any sunlight .
Explanation: ///APEX 8/21/19
State officials are considering constructing a road through a forested wilderness area. This action will likely affect the forest ecosystem in various ways. Part A: Predict how the construction of a road could negatively affect plants and animals in that ecosystem. (3 points) Part B: Describe one way that the construction of a road could have a positive impact of the forest ecosystem. (1 point)
Part A
The construction of roads, in general, tends to have negative effects on the flora and fauna. The construction itself means that lot of vegetation has to be cleared, thus destroyed, in order for the road to be constructed. If additional objects are set along the road, that will mean even more destroyed vegetation. The animals suffer mostly by being hit by vehicles as they do not know how to react to them. Their movement is stopped as they can not cross the roads, and the noise often drives them further away from it, meaning that the have to change their habits, or become exposed to predation. The humans also have much easier access in the interior of the forests, so there's always the big danger of destroying the forests by logging, and destroying the animal communist by poaching.
Part B
The roads can have positive effects on the forest ecosystems too, not just negative ones, but in order for that to be the case, the roads have to be planned and managed carefully. If the roads are planned carefully, by taking the forest ecosystem in consideration, then the roads can actually be very beneficial. The benefit can come in a way that the roads can be constructed in the areas of the forests that are not in danger and are not very sensitive, while in meantime being further away from the areas that are actually sensitive and very vulnerable, thus protecting them. Also, a carefully planned road, will have lot of places through which the animals can move from one side to another side of it, without having to cross the road, thus not influencing their movement and migratory patterns.
A population of cheetahs has a birth rate of 5 and a death rate of 15. Immigration is 2, and emigration is 4. What is its population growth? –14 –12 12 14
The answer is -12
Starting with a base of 0 cheetahs:
5 are born (0+5=5)15 die (5-15=-10)2 come (-10+2=-8)4 leave (-8-4=-12)After everything happens, the cheetah population has overall lost 12 cheetahs.
The population growth rate is -12. Therefore, option (B) is correct.
What is population growth rate?Population growth rate is a measure of the change in the size of a population over a given period of time, usually expressed as a percentage. It is calculated by subtracting the number of deaths and emigrants from the number of births and immigrants within a given time period, and dividing this result by the initial population size. The resulting number indicates whether a population is growing, declining, or remaining stable over time.
A positive growth rate means that the population is increasing, while a negative growth rate means that the population is decreasing. Population growth rate is an important indicator of the sustainability of a population and can have significant social, economic, and environmental implications.
To calculate the population growth rate, we need to subtract the death rate and emigration from the birth rate and immigration:
Population growth rate = (birth rate + immigration) - (death rate + emigration)
Plugging in the given values, we get:
Population growth rate = (5 + 2) - (15 + 4)
Population growth rate = 7 - 19
Population growth rate = -12
Therefore, the population growth rate is -12.
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Garth has had a number of drinks and cannot walk a straight line: the alcohol appears to have affected his:
Cerebellum
Since brainly wont let me provide a link, the website is talk2prevent and its a pdf
Lactase is essential for digesting lactose in milk. This enzyme is specific for this sugar. Why?Molecules and active sites vary in size; only properly sized molecules can fit.There is a precise compatibility between the active site and the lactose molecule.Specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed.Reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.
Answer:
There is a precise compatibility between the active site and the lactose molecule.
Explanation:
An enzyme's active site has a specific shape, where only the substrate it is designed for can fit. It's much like a puzzle, where you must have the right pieces join together or else you wont get a coherent picture.
Lactase is an enzyme specifically designed to digest lactose because of its unique structure that allows it to bind only to the lactose molecule, triggering its hydrolysis into glucose and galactose. This process occurs due to the matched compatibility between the active site of lactase and the lactose molecule. This is a demonstration of enzyme specificity.
Explanation:The enzyme Lactase is specific for digesting the sugar lactose because there is a unique compatibility between the active site of the enzyme and the lactose molecule. This is due to the concept of enzyme specificity, which means that each enzyme is shaped in a way that allows it to interact with only a specific molecule or group of molecules. In this case, the lactase enzyme has the perfect structure for binding with lactose, enabling it to catalyze the hydrolysis (the breakdown using water) of lactose into glucose and galactose.
Specifity also refers to the action of the enzyme, and in this case, hydrolysis, with only a few molecules being able to undergo this process. Thus, it is only the lactose molecule that fits into the lactase active site, similar to a key going into a lock, allowing lactase to fulfill its role.
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Through which structure do wastes pass into the rectuin?
a. large intestine
b. villus
c. small intestine
d. duodenum
Answer:
A. Large intestine
Explanation:
This is because that's how the body works lol :)
Through large intestine waste is passed into the rectum.
Explanation:
In the digestive system the digested food material present in the stomach travels gradually from the duodenum to the small intestine where it splits into small molecules.
Whereas, absorption of those food material takes place through the small finger like structures present in the small intestine known as villi (singular-villus). After small intestine the food enters into large intestine where it reaches to the rectum to be excreted as waste.
Which reproductive gametes are powered by many ATP and flagella? A. Blastula B. Eggs C. Sperm D. Ovum
Sperm is reproductive gametes are powered by many ATP and flagella.
It is the male gamete whose movement is powered by ATP.What is a gamete?Gametes are an organism's reproductive cells. They are also referred to as sex cells. Female gametes are called ova or egg cells and male gametes are called sperm. Gametes are haploid cells and each cell carries only one copy of each chromosome.What is the function of gametes?
Gametes serve two functions:-
They have the physiological capability to fuse with a gamete from the opposite s.e.x.It form a single cell that initiates the development of a new organism and the next generation.Hence, C option is correct.
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Please help me somebody. Honey Bees are becoming extinct. Which biotechnology could we use to help alleviate that problem and produce more honey bees?
A: Genetic engineering
B: Cloning
B: Artificial selection / Selective breeding
Answer:
Cloning
Explanation:
im doing the same study guide
Which nutrients contain nitrogen in addition to carbon hydrogen, and oxygen? A) vitamins. B) proteins. C) carbohydrates. D) fat
Answer:
B
Explanation:
Proteins contains nitrogen, including carbon, oxygen, and hydrogen
How is the waxy cuticle of land plants an adaptation for living on land?
A. It coats pollen grains and enables them to float on wind currents
B. It provides strength that enables plants to grow tall.
C. It enables the male pollen grains to recognize female parts.
D. It coats leaves and stems and reduces the loss of water.
Answer:
D. it coats leaves and stems and reduces the loss of water
An automobile breaks to a stop from an initial speed of 14 meters per second in 7 seconds. What is the automobile's deceleration?
Answer:
Acceleration= -2m/s
Deceleration=2m/s
Explanation:
(0-14)/7
-14/7
-2
A scientist asks a question and discovers that increased temperature decreases the number of offspring that an organism produces. Then, the scientist asks a new question about the impact of climate change on the species because the scientist's first question was not a scientific question. The scientist modified the hypothesis for the investigation. The results of the investigation led to new scientific questions. Questions about the impact of temperature reflect an opinion.
Answer the results of the investigation led to new scientific questions.
Explanation:
Answer:
The correct answer will be option the results of the investigation led to new scientific questions.
Explanation:
A scientific question is a question which explains any natural phenomenon, should have answers based on the observations which could be tested leading to the generation of a new hypothesis.
In the given question he asks a new question which shows that the old scientific questions has been answered but not real answer so it leads to the generation of new puzzles or questions one of which is "To study the impact of climate change on the species".
Thus, the results of the investigation led to new scientific questions is the correct answer.