Answer:
20
Explanation:
Primary teeth also known as deciduous teeth, milk teeth, are the first set of temporary teeth in the growth development of humans. They develop during the embryonic stage of development, become visible in the mouth during infancy (erupt) and usually get replaced by permanent teeth around age six (the first tooth). The primary teeth consist of 4 central incisors (one in each quadrant), 4 lateral incisors, 4 canines, 4 first molars, and 4 secondary molars.
Explain in your own words the order in which the creature's traits may h ave evolved, starting from the first likely trait. (Hint: Which trait is most common across the creatures?)
Traits in creatures evolve starting with the most common features. These shared ancestral characters are present in all organisms within a group due to descent with modification. New variations give rise to shared derived characters, which help form new branches on the phylogenetic tree.
Explanation:When considering the evolution of creature traits, we start with the most basic and common features spread across a group of organisms. The process generally begins with a change in the genetic makeup, leading to a new and persistent trait.
A shared ancestral character is a trait found in the ancestor of a group and present in all organisms within that group. For example, the presence of a backbone in vertebrates is such a character. Descent with modification means that over time, new variations emerge, some of which are adaptive and become new traits. This leads to the formation of a new branch in the phylogenetic tree, indicating a shared derived character that's not present in all ancestral lines but only in the descendants from a certain point onward.
The presence of traits like hair in lizards, frogs, and rabbits based on a phylogenetic tree, must clarify that only descendants of the last common ancestor that had the trait will possess it. For example, not all vertebrates have hair because it evolved later and is only seen in mammals, which are not directly ancestral to lizards or frogs.
The first likely trait to evolve is the most common trait found across all creatures, followed by the emergence of less common traits.
To determine the order of trait evolution, start by identifying the trait that is most universally present among the creatures, as it indicates a fundamental and early adaptation. This trait likely provided a significant survival advantage, allowing it to become widespread.
Subsequent traits likely evolved as creatures adapted to more specific environmental niches or challenges. For example, if a common trait is a basic structural feature like bilateral symmetry, it likely evolved first, providing a foundation for more complex traits such as specialized limbs or sensory organs.
By comparing the distribution of traits across different creatures, we can infer the sequential evolution of these adaptations, with the most pervasive and fundamental traits appearing earliest in the evolutionary timeline.
What kind of habitat did tiktaalik live in?
Tiktaalik roseae was discovered in sediments on Ellesmere Island in Nunavut, Artic Canada (Ahlberg and Clack, 2006). The sediments it was found in are from what is known as the Fram Formation, which is thought to be deposits of lowland streams (Murphy, 2005). hope it helps
Most farms were once tilled by animals pulling plows. Today, mechanized plows can quickly till large areas of land. How have mechanized plows most likely affected modern agriculture? A. Mechanized plows allow a wider variety of crops to be planted on a farm. B. Mechanized plows help decrease erosion. C. Mechanized plows help improve a farm's soil quality. D. Mechanized plows allow larger areas to be farmed by a single farmer.
Answer:
The correct answer is "Mechanized plows allow larger areas to be farmed by a single farmer."
Explanation:
Mechanized plows allow large areas of land to be plowed quickly. A further benefit is that mechanized plows do not fatigue as people and animals do. Because of this, mechanized plows help contribute to the increasing size of modern farms.
Answer:
Mechanized plows allow larger areas to be farmed by a single farmer.
Explanation:
i did it and got it wright
When grass is randomly distributed throughout an environment, a population of deer that eats grass is most likely to have a _____ pattern. A) grouped B) uniform C) clumped D) random
Answer:
Random distribution.
Explanation:
The distribution of the population in space across an area is largely driven by the food and other resources in the environment. Uniform, random and clumped are the main distribution pattern.
The grass is distributed randomly in the environment, the population of deer is most likely to have random distribution pattern. Since, the distribution pattern depends upon the food resources so the deer have random distribution in space.
Thus, the correct answer is option (D).
he majority of Earth's atmosphere is nitrogen, N2. The percentage of nitrogen in Earth's atmosphere remains constant as prescribed by the law of conservation of matter and because it is a reasonably non-reactive gas. Like carbon, nitrogen is cycled through Earth's spheres. However, nitrogen can be converted into forms usable by plants and animals, either by lightning or bacteria. Once converted to usable forms, nitrogen is able to cycle the rest of the way through the ecosystem. Much like carbon, the recycling of nitrogen through Earth's spheres relies heavily on what type of organism? A) autotrophs B) decomposers C) parasites D) producers
Answer:
B
Explanation:
Decomposers such as Cellulomonas bacteria convert the nitrogen in the dead matter into ammonia while Nitrosomonas bacteria convert the ammonia into nitrites that are absorbed by plants as nutrients. In addition, nitrobacters convert the nitrites to nitrates also absorbed by plants.
The major means of propulsion through the alimentary canal is peristalsis.
True
False
Answer:
True
Explanation:
Peristalsis is the wave-like motion of the walls of the alimentary canal that allow food to move along the lumen of the alimentary canal towards the posterior (anus). These waves are powered by the contraction and relaxation of the smooth muscles.
Which statement is an example of a scientific theory?
Answer:
B
Explanation:
B is referring to cell theory, which basically states that all living things are made of cells and all cells come from other cells withe the exception of the first life forms.
Why is Tokyo considered the world leader in stopping water leakage?
Answer for plato users:
Tokyo has developed the largest flood defense in the world. It consists of five enormous underground storm-water tanks. These tanks can store water from a heavy downpour. This type of effort makes Tokyo the world leader in stopping water leakage.
Answer:
Tokyo has developed the largest flood defense in the world. It consists of five enormous underground storm-water tanks. These tanks can store water from a heavy downpour. This type of effort makes Tokyo the world leader in stopping water leakage.
Explanation:
PLEASE HELP
Plants play an important role in the carbon cycle by producing carbohydrates. Which of the following organelles enables plants to make carbohydrates from carbon dioxide and water?
Question options:
A cell wall
A central vacuole
A chloroplast
A nucleus
➷ The correct option would be a chloroplast. A chloroplast. A chloroplast allows light to be taken in to carry out photosynthesis and then form all necessary products.
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Answer:
A chloroplast
Explanation:
Chloroplasts are the cell organelles in which photosynthesis reactions occur, which use light energy to produce organic molecules. These important structures are found in green algae and plants. Chloroplasts are very important organelles for the functioning of the plant organism, through which plants play an important role in the carbon cycle, producing carbohydrates as they allow plants to produce carbohydrates from carbon dioxide and water.
What does the Magnuson Stevens Act deal with?
A.
setting up of marine sanctuaries
B.
prevention of overfishing
C.
regulating disposal of materials into the ocean
D.
protection of marine mammals
The main concern of the Act is that it explains the role of regional fishery management councils and describes their functions and operating procedures. The Magnuson Stevens Act was established in 1976 for
B. prevention of overfishing
Answer:
The Magnuson Stevents Act deals with:
B. prevention of overfishing
Explanation:
The Magnuson-Stevens Fishery Conservation and Management Act is a legal provision that seeks the optimal exploitation of the United States coastal fisheries enacted in 1976. It is oriented to aim for sustainability and the preservation of resources to take care of them so the ecosystems can be recovered and allow exploitation in further times. It is a very good act that secures United States ecosystems to be exploited and maintained.
Notice the population of beetles. The allele for color is seen on their backs: green and brown alleles. Over time, through random chance, the gene pool of the beetle population changes. Eventually the gene pool contains only green alleles. This is an example of A) gene flow. B) adaptation. C) genetic drift. D) natural selection.\
The situation where a beetle population's gene pool changes to contain only green alleles through random events is an example of genetic drift, a process where allele frequencies can shift due to chance, leading to gene fixation in some cases. C) genetic drift. is the correct option.
The scenario described in the student's question, where over time, through random chance, the gene pool of the beetle population changes eventually containing only green alleles is an example of genetic drift. Genetic drift can lead to the elimination of alleles from a population purely by chance, as described in Figure 19.2B.1, where a natural event, like a wildfire, may selectively destroy certain individuals regardless of their genetic traits. This can result in significant changes in the allele frequencies in a population, especially in small populations, where chance events can have larger impacts. Similarly, gene fixation can happen when certain alleles become more prevalent solely due to random sampling of organisms that reproduce, as depicted in Figure 19.1 A. 1. This is different from natural selection, which involves traits conferring a survival or reproductive advantage, thereby increasing the frequency of those advantageous alleles over time.
what is a consequence to the organism if helper-t cells are destroyed by a pathogen, such as HIV?
the immune system wouldn't be able to signal B cells to produce antibiotics and the T cells wouldn't be able to kill infected cells that are targeted.
Hloroplasts are energy organelles found in _____. animal cells plant and animal cells all living cells plant cells
I am going to assume you meant "chloroplasts" instead of "Hloroplasts"
Your answer will be plant cells
Chloroplasts makes the energy for the plant by conducting photosynthesis, therefore, they are only found in plant cells.
Fungi have an extremely high surface-area-to-volume ratio. What is the advantage of this to an organism that gets most of its nutrition through absorption?
A) The larger surface area allows for more material to be transported through the cell membrane. B) The lower volume prevents the cells from drying out too quickly, which can interfere with absorption.C) This high ratio creates more room inside the cells for additional organelles involved in absorption.D) This high ratio means that fungi have a thick, fleshy structure that allows the fungi to store more of the food it absorbs.
The correct answer is: A) The larger surface area allows for more material to be transported through the cell membrane.
Fungi are usually in the form of complex network of filaments -mycelium. Mycelium consists of hyphae that are long, thin and branched which gives them high surface area to volume ratio. This property makes fungi well-adapted for absorption of nutrients from soil and other substrates.
A larger surface area allows for more material to be transported through the cell membrane, providing fungi with efficient nutrient absorption necessary for their survival.
Fungi have a high surface-area-to-volume ratio, particularly in the structure of their mycelia and hyphae. This ratio is advantageous because it increases the efficiency of absorption. Since fungi are heterotrophic and rely on absorbing nutrients through their mycelia, having a larger surface area compared to their volume means there is more 'space' exposed to the environment, facilitating a greater and faster intake of nutrients. Furthermore, fungi release enzymes, like cellulase, into the environment that digest large organic molecules into smaller, absorbable forms. This digestion occurs externally, and the products are then absorbed by the fungi. Therefore, the larger surface area allows for more material to be transported through the cell membrane, making option A the correct answer.
How did scientists discover that rocks farther away from the mid- ocean ridge were older than those near it?
Scientist discovered that rocks farther away from the mid-ocean ridge were older than those near it by determining the age of rock samples obtained by drilling on the sea floor.
hope that helps
PlZ HeLp 20 Points Which of the following is an example of reducing?
A
using the same bag every time you go shopping
B
taking a shorter shower
C
turning old aluminum cans into new ones
D
throwing your trash in the garbage
Answer:
B. taking a shorter shower
Explanation:
Using the same bag would be reusing
Taking a shorter shower reduces the amount of water you use.
Turning old cans into new ones is recycling.
Throwing your trash in the garbage is wasteful.
Final answer:
The correct answer is C) turning old aluminum cans into new ones, as it exemplifies reducing by recycling materials and thereby conserving resources.
Explanation:
Understanding Reducing, Reusing, and Recycling
In the context of environmental conservation, the term reduce refers to the strategy of minimizing the amount of waste produced by consuming fewer products or choosing products with a lower environmental impact. The act of turning old aluminum cans into new ones recycles materials, thereby reducing the need to extract and process new raw materials. This is beneficial for the environment as it saves energy and reduces greenhouse gas emissions. On the other hand, using the same bag every time you go shopping is an example of reusing, which extends the life of products. Taking shorter showers helps conserve water and energy but is not directly related to waste reduction, and throwing trash in the garbage is merely waste disposal without reducing or recycling.
Answer: C) turning old aluminum cans into new ones is an example of reducing because it involves processing used materials to create new products, thereby reducing the need to use new resources.
Which light-sensitive vitamin is abundant in milk? riboflavin alpha-tocopherol vitamin c thiamin?
I would say the thiamin is more light sensitive.
Vitamin D, which is present in fortified milk and produced by exposure to sunlight, is the light-sensitive vitamin mentioned in the question.
Explanation:Among the options provided, the light-sensitive vitamin that is abundant in milk is vitamin D. This vitamin is often added to products such as milk through a process called fortification. Besides milk, certain types of fatty fish also have high quantities of Vitamin D. It can also be produced by our body when our skin is exposed to sunlight. People, especially those of darker complexion or those living in higher latitudes with less sunlight, often don't produce enough Vitamin D and may need supplements.
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Which of the following is NOT involved in glycogen synthesis?GlycogeninAmylo-(1,4 to 1,6)-transglycosylaseGlycogen phosphorylaseUDP-glucoseGlycogen synthase
The correct answer is: Glycogen phosphorylase UDP-glucose
Steps of glycogen synthesis (glycogenesis) are:
• Glucose conversion into glucose 6-phosphate by the glucokinase enzyme
• Glucose-6-phosphate conversion into glucose-1-phosphate by the phosphoglucomutase enzyme
• Glucose-1-phosphate conversion into UDP-glucose by the enzyme UDP-glucose pyrophosphorylase
• Creation of initial short glycogen chains by glycogenin
• UDP-glucose is added to the growing glycogen chain to the 4-hydroxyl group of the glucosyl residue by the glycogen synthase enzyme
• Branches are made by glycogen branching enzyme (amylo-α(1:4)→α(1:6)transglycosylase).
Glycogen phosphorylase is not involved in glycogen synthesis; it is involved in breaking down glycogen. Instead, enzymes like glycogen synthase, glycogenin, and amylo-(1,4 to 1,6)-transglycosylase play key roles in the synthesis of glycogen.
Explanation:The molecule that is NOT involved in glycogen synthesis is glycogen phosphorylase. This enzyme is actually involved in glycogen breakdown, not its synthesis. Glycogen synthesis involves several key enzymes and steps that include the phosphorylation of glucose to form glucose-6-phosphate (G6P), isomerization to create glucose-1-phosphate (G1P), and the subsequent formation of UDP-glucose. Glycogen synthase then catalyzes the addition of UDP-glucose to the growing glycogen chain. Glycogenin serves as a primer for glycogen synthase and amylo-(1,4 to 1,6)-transglycosylase, also known as the glycogen branching enzyme, is responsible for introducing branches into the glycogen molecule.
A national caterer determined that 87% of the people who sampled their food said that it was delicious. a random sample of 144 people is obtained from a population of 5000. the 144 people are asked to sample the caterer's food. if modifyingabove p with caretp is the sample proportion saying that the food is delicious, what is the mean of the sampling distribution of modifyingabove p with caretp?
The survey has only 2 answers- yes or no- and these answers are non-numeric, and therefore catigorical. Categorical data cannot be represented by a distribution curve so no, the data cannot have a normal distribution. If on the other hand the people were asked to rate the food on a numeric scale ( say, 1 to 10 or 1 to 100) you could plot the responses and get a distribution curve, which could be normal.
Which term is used to describe a group of arctic foxes that live in part of Alaska's Arctic National Wildlife Refuge?
Population is the term that is used to describe a group of arctic foxes that live in part of Alaska's Arctic National Wildlife Refuge. The correct option among all the options given in the question is the third or the second last option. The area covered by Arctic National Refuge is approximately 19.6 million acres. It has a variety of wild animals living in it.
The term used to describe a group of arctic foxes that live in part of Alaska's Arctic National Wildlife Refuge is C. population.
Population refers to all inhabitants of a particular area - since all of these arctic foxes live in the same place, they are a population.
List the 5 steps in the fetch/execute cycle, and describe each. explain how these steps correspond to eating at a restaurant.
A molecule that blocks the activity of carbonic anhydrase would immediately. . .
a. decrease the amount of carbon dioxide dissolved in the plasma
b. cause an increase in blood pH.
c. Interfere with oxygen binding to hemoglobin
d. increase the amount of bicarbonate formed in the blood.
e. all of the above
Answer:
b. cause an increase in blood pH.
Explanation:
Carbonic anhydrase is an enzyme responsible for accelerating the conversion of carbon dioxide to carbonic acid, and is responsible for controlling blood pH. When this enzyme is inhibited by some molecule. In addition, inhibition of this enzyme reduces the amount of bicarbonate formed in the blood, since there will be no conversion of carbonic acid occurring at speed.
A molecule that blocks the activity of carbonic anhydrase will immediately reduce the amount of carbon dioxide dissolved in the plasma, cause an increase in blood pH, interfere with oxygen binding to hemoglobin, and increase the amount of bicarbonate formed in the blood will increase. Therefore, the correct option is E.
A compound that inhibits carbonic anhydrase will have a variety of consequences. An enzyme called carbonic anhydrase helps convert carbon dioxide and water into carbonic acid, which then splits into bicarbonate ions and hydrogen ions. As a result, inhibiting carbonic anhydrase will lower carbon dioxide levels, raise blood pH, probably inhibit the binding of oxygen to hemoglobin, and increase the amount of bicarbonate generated in the blood.
Therefore, the correct option is E.
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Can anyone tell me the answer?
bpwhamburgorchardpark.org Has a short video on it.
Thye answer should be A.)
Which of the following statements is correct with respect to the evolutionary relationship between chordates and invertebrates?
a. chordates are most closely related to arthropods
b. chordates evolved from echinoderms
c. chordates are more closely related to echinoderms than to arthropods
d. chordates are most closely related to the tunicate type of echinoderms
The correct answer is: c. chordates are more closely related to echinoderms than to arthropods
The Closest nonchordate relatives to Chordates are Echinodermata. Hemichordates (such as acorn worms) and Echinodermata form the Ambulacraria which is the sister phylum of the Chordates.
Echinoderms and chordates are both deuterostomes, but the differences are that Echinoderm possess bilateral symmetry only as larvae, they have tube feet and their bodies are supported by calcite skeletons.
Answer:
Echinoderms and chordates are found on the same clade.
Explanation:
What condition should be met for the stellar parallax method to be useful?
A.the star should be situated within the Milky Way
B.the star should be brighter than the Sun
C.the star should be close enough to the Sun to show a measurable parallax
D.the star should be visible with the naked eye
Answer: c
Explanation:
Answer:
The answer is: C. the star must be close enough to the Sun to show measurable parallax.
Explanation:
In the field of astronomy, parallax is called stellar parallax in distant stars.
The stars for which parallax measurements have been made are those that are relatively close to the sun on the galactic scale.
The answer is: C. the star must be close enough to the Sun to show measurable parallax.
What are two main types of posttranscriptional modifications that take place in the mRNA of eukaryotes?The excision of the introns and the addition of a 7-mG cap to the 3' end.The addition of a poly-T sequence at the 5' end of the gene and the addition of a poly-U tail at the 3' end.The addition of a 7-mG cap at the 5' end of the transcript and the addition of a poly-A sequence at the 3' end of the message.The addition of a poly-A sequence at the 5' end and the addition of a 7-mG cap at the 3' end of the RNA transcript.
The correct answer is: The addition of a 7-mG cap at the 5' end of the transcript and the addition of a poly-A sequence at the 3' end of the message
These posttranscriptional processes are called:
• 5’ capping - It protects the mRNA from 5' degradation by exonucleases. Cap is also involved in ribosomal binding.
• Polyadenilation or addition of poly(A) tail – It also protects mRNA from degradation of 3’exonucleases. A long poly(A) tail can also increase translation.
The liver and pancreas are connected to the:
i believe the answer is the gallbladder because, the gallbladder sits under the liver, along with parts of the pancreas and intestines. The liver and these organs work together to digest, absorb, and process food.
Answer:
intestines
Explanation:
Why do enzymes only work on their specific substrates
Enzymes only work on their specific substrates because enzyme catalysis involves enzyme and substrate binding to form an enzyme substrate complex.
In other words, the of substrate substances an enzyme can bind to leading to the specificity of enzyme activity aids in causing the correct reaction in the particular structure.
Enzymes only work on their specific substrates because there is a specific match between the enzyme and its substrates. This match is known as induced fit and it allows the enzyme to bond with the substrate at its active site. Enzymes are known for their specificity, but some enzymes can act on several similar substrates.
Explanation:Enzymes only work on their specific substrates because there is a specific match between an enzyme and its substrates. The enzyme's active site, which is the location on the enzyme where the substrate binds, has a shape that allows it to bond to a specific substrate. This specific match is known as induced fit, where the enzyme structure slightly changes to find the best fit between the substrate and product. Overall, enzymes are known for their specificity, but there is some flexibility as some enzymes can act on several different structurally related substrates.
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Which statement accurately describes reproduction in animals?
All animals can reproduce asexually, and some can reproduce sexually.
All animals can reproduce sexually, and some can reproduce asexually.
Animals only reproduce sexually.
Animals only reproduce asexually.
B) All animals can reproduce sexually, and some can reproduce asexually
Answer: All animals can reproduce sexually, and some can reproduce asexually.
Explanation:
Animals can range from simple to complex eukaryotic organisms. These belongs to the kingdom Animalia. Depending upon the complexity of their body they can reproduce asexually or sexually. Majority of the animals exhibit complex body types hence they are capable of forming the gametes. The fusion of these gametes produces offsprings this mode of reproduction is called as sexual reproduction. For example, dogs and cats. But some animals may exhibit simple body types or they are incapable of finding mates such organisms undergo asexual reproduction such as hydra, some lizards and sharks.
The purpose of an experiment is to compare results with a ____ A hypothesis B theory C answer D variable
The purpose of an experiment is to compare results with a hypothesis. Hypothesis is defined that the theory or ideal is not proven yet.