bio help! will mark brainliest
which of the following is an example of prezygotic isolating mechanisms?

a. two strains of rice produce a hybrid, which can produce fertile offspring, but its offspring is small and sterile.

b. a horse and a donkey may interbreed, but the offspring, a mule, is not fertile.

c. the sperm of species A dies when It comes in contact with the female reproductive tract of species B.

d. two salamander species mate, but the offspring does not complete development and dies.

I think its b, but I'm not too good with stuff like this. So I thought I'd get a second opinion (and an explanation?). thank you tons!

Answers

Answer 1
Hi there!

A prezygotic isolating mechanism is a mechanism that causes something to happen, not allowing the organisms to breed before fertilization. I'll explain each one for you.

A - That is postzygotic because the organisms were not stopped before fertilization. The result is a sterile organism.
B - Again, that is postzygotic because the organism was produced. 
C - This is prezygotic! The sperm dying shows that something is in action to prevent fertilization, meaning that it cannot happen.
D - Fertilization was successful, so it is postzygotic.

ANSWER:
C - the sperm dies when it reaches the female tract

If you need help with any more problems, feel free to message me and I'd be more than happy to help you work through them and provide explanations.

Hope this helps!! :)
If there's anything else that I can help you with, please let me know!
Answer 2
Hey there! 

I think it's C, if you need anything feel free too ask. I would love too help! <3



Related Questions

The set-point theory suggests that when a person is on a restrictive diet, the body responds by initiating physiological changes that

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The correct answer is 'slow down the basal metabolic rate.'The set-point theory suggests that the body lowers the energy expenditure on a restrictive diet to be able to continue functioning normally. 

if retinal detachment occurs in the macula lutea, one can predict that there would be a significant loss of ______.

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The correct answer is color vision.
The macula lutea is an area near the center of the human's eye retina. It has an oval shape and is responsible for the high-resolution color vision we have under good light conditions. If the macula lutea is destroyed, due to macular degeneration or a retinal detachment, then this color vision is impaired.

What three mechanisms regulate the heart?

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The three mechanisms which regulate the heart are endocrine, cardiovascular and Sinoatrial nodes.
The endocrine system consists of the glands and hormones of the human body. The cardiovascular system is the organ system which is responsible for the circulation of the blood around the body and the oxygenation of the body's tissues. The sinoatrial node (SA node) generates the electrical impulses and is considered the natural pacemaker of the heart.

what disorders are found on chromosome 17?

Answers

Autism, Schizophrenia, leukemia, 

could you give me brainliest if correct?

Answer:

List the genetic disorders found on chromosome 17.

Tumor suppressor protein

Charcot-Marie-Tooth syndrome

Breast cancer

Explanation:

The first cell type likely to respond to invasion by a pathogenic microbe is

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Hello, and good afternoon. Great question. Moreover, the only immunization cell type responders are the white blood cells that usually release pathogenic eradicators called antibodies.

"if you wanted to portura, where would you look?" in the soil in leafe litter under stones or bark in animal burrows all of these places

Answers

The correct answer is:  [E]:  "all of these places" .
______________________________________________________
Note:
______________________________________________________
that is:
______________________________________________________
Choices provided for:  [A]; [B]; [C]; and [D];  are correct:
______________________________________________________
  "in the soil" ;
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Transcription makes which nucleic acid?
Protein
RNA
DNA
Polypeptide

Answers

The answer is RNA. RNA is composed of ribose sugars monomers. Their difference with deoxyribose sugars is that there have an H other than an OH in the 2’ carbon of their rings. In addition, RNA has similar bases as DNA other than Adenine which is replaced by Uracil in RNA.






What do scientists know about extrasolar planets? There are very few that are habitable. There are several that have liquid water on them. They don’t exist. There are likely billions of them in the galaxy.

Answers

There are likely billions of them in the galaxy

i believe the answer is the 3rd one

there are likely billions of them in the galaxy

A client severely injured in a motor vehicle accident is rushed to the health care facility with severe head injuries and profuse loss of blood. which sign indicates approaching death?

Answers

profuse loss of blood. if an individual loses a certain amount of blood they can die (bleed to death). head injuries tend to bleed a lot; sometimes blunt force trauma to the head can result in internal hemorrhaging and swelling of the brain. In this case not knowing the condition of his brain with the information given the profuse loss of blood is the most likely answer.

Final answer:

The correct option is Client's breathing becomes noisy. Approaching death in a severely injured client is indicated by noisy breathing, known as a 'death rattle.' Other signs include a weak or absent pulse, cool extremities, pale skin, and decreased urine output.

Explanation:

Approaching death is indicated by several physiological changes as the body begins to shut down. In the case of a client severely injured in a motor vehicle accident with severe head injuries and profuse loss of blood, the sign that indicates approaching death would be noisy breathing, often referred to as a "death rattle," which is due to relaxed throat muscles.

In addition, other signs that death is imminent include a weak or absent pulse, extremities that are cool or cold to the touch, skin that becomes pale and waxen, and a noticeable decrease in urine output.

Healthcare providers must recognize these symptoms to provide the appropriate end-of-life care and prepare the client's loved ones for the impending loss.

What percent of earths water is found in the ocean ?

Answers

Hi there!

Earth is covered in about 71% water. 96.5% of the water on earth comes from our oceans. 

Hope this helps you!

~DL

In an ecosystem, can there be more carnivores than herbivores? Explain why or why not?

Answers

Yes. In a desert, which mostly is sand, insects, and animals, there are mostly carnivores. Carnivores are animals that eat meat. there is little vegetation in deserts because of the dry soil and lack of rain. 
No, thee must be a balance between the two. Too many carnivores mean the herbivores will be hunted way r quickly and will die off, however way to many herbivores means the grass and plant supply will run out. If the two aren't balanced properly the ecosystem will be out of balance.

The USGS estimates that the United States uses less than 200 billion gallons of water a day. Please select the best answer from the choices provided T F

Answers

For the answer to the question above, I believe the answer is "FALSE"
As of 2010, the U.S. uses a gallon of 355,000 million gallons of water per day or 397,000 thousand acre-feet per year.
I hope my answer helped you.



The answer to this question is FALSE :)

An acute or chronic skin inflammation characterized by erythema, papules, vesicles, pustules, scales, crusts, scabs, and possibly itching, is known as

Answers

The symptoms you have listed are describing ECZEMA. There is no exact cause of this skin condition, however, it could possibly come from your genetics or your body's immune system overactive response to something irritating that came across it such as a type of food you eat. 

Let me know if you need anything else. 

                         - Dotz

"The correct term for the skin condition described is ""dermatitis.""

Dermatitis is a general term that encompasses a range of skin conditions characterized by inflammation of the skin. The symptoms mentioned, such as erythema (redness), papules (small, raised bumps), vesicles (small fluid-filled blisters), pustules (pus-filled blisters), scales (flaky skin), crusts, scabs, and itching, are all indicative of various forms of dermatitis. This condition can be acute, with a sudden onset and short duration, or chronic, with symptoms persisting over a longer period. The causes of dermatitis can vary widely, including allergic reactions, irritants, genetic factors, and systemic diseases. Treatment depends on the cause and may include topical corticosteroids, antihistamines, and lifestyle modifications to avoid irritants and allergens."

Captive breeding programs are used to

Answers

To repopulate and introduce species into the wild

They are used to replenish the wild populations of endangered species.

In a gene cloning experiment, why are white colonies desirable (rather than blue colonies)?

Answers

This is because the white colonies are the ones that have taken up the recombinant DNA, while the blue ones have not. This is called blue-white screening, a molecular cloning technique, and is conducted on X-gal medium and utilized selection using the beta-galactosidase gene.

As part of a simulation of evolutionary process, a teacher drops 500 red and 500 green jelly beans on green grass. the red and green jelly beans represent individuals of the same species. students represent predators and pick up as many jelly beans as possible in 30 seconds. which prediction is most accurate?

Answers

The answer should be: green individuals are more likely to survive and reproduce

In a green grass field, green beans will be hard to be noticed. Unlike the green beans, the red beans will have a high contrast to the green color of the grass. This makes the red bean easier to found and eaten by the predator. Green individuals will be more likely to survive and reproduce because it could blend with the grass.

Final answer:

In a simulated evolutionary process using jelly beans as prey and students as predators, it would be predicted that more red jelly beans would be picked up than green ones due to the green jelly beans' camouflage in a green grass environment, illustrating natural selection.

Explanation:

In the jelly bean simulation, the most accurate prediction would involve predation pressure and camouflage. As the simulation takes place, students will likely pick up more red jelly beans than green jelly beans because the red ones will stand out against the green grass, and the green ones will be harder for the 'predators' students to see. This represents a selection pressure similar to that in nature, where individuals that blend into their environment are less likely to be preyed upon, and therefore, more likely to survive and reproduce.

If the red jelly beans are deemed to be eaten and thus removed from the gene pool, we would expect the population of jelly beans over subsequent generations to have more green individuals. This simulation represents natural selection, where the green jelly beans have a survival advantage in this environment due to their camouflage, a form of natural selection that can lead to evolutionary changes in the population over time.

Determine if the statement is true or false.

The idea of uncontrollable criminal impulses based on an offender's genetic makeup was proven by the Human Genome Project.


False



True

Answers

your answer is *false*

Answer:

The statement is false.

Explanation:

The human genome project was scientific research that took place globally with the aim of determining the genes that make up the human genome and information about the sequence of base pair of nucleotide forms human DNA.

It was used to find out the map and identify all genes of the human genome with function and physical aspect.

Thus, the correct answer is - a false statement.

vertebrates and tunicates share _____.

Answers

A vertebrate is an animal that has a spinal cord which is surrounded by bone/cartilage just like us humans while tunicates are marine animals. They both share hollow nerve cords, dorsal (which is the back of an animal/human), and notochord (a skeletal rod surrounded by cartilage). 

I hope I was able to help you. :)

Vertebrates and tunicates share a common chordate ancestry

Vertebrates and tunicates share a common ancestry and are both members of the phylum Chordata. Chordates are characterized by the presence of a notochord, a flexible rod-like structure that provides support.

During their embryonic development, both vertebrates and tunicates possess a notochord, which is one of the defining features of the phylum Chordata.

The notochord, typically present in the early stages of development in both groups, plays a crucial role in providing structural support.

In vertebrates, the notochord is eventually replaced by the vertebral column, while in tunicates, it regresses as they mature into their adult form.

Additionally, both vertebrates and tunicates exhibit a hollow, dorsal nerve cord, another distinctive characteristic of chordates.

This nerve cord develops into the central nervous system, which is the brain and spinal cord in vertebrates, and a simplified nerve ganglion in tunicates.

Despite these similarities, it's important to note that tunicates and vertebrates have significantly diverged in terms of their adult morphology and lifestyle.

Vertebrates are complex, multicellular organisms with well-developed nervous, circulatory, respiratory, and skeletal systems.

In contrast, tunicates, also known as sea squirts, are simpler, filter-feeding marine organisms.

For such a more question on Vertebrates

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The __________ used a buffer overflow exploit in "fingerd" as one of its attack mechanisms.

Answers

The Morris internet Worm used a buffer overflow to exploit in "fingerd" as one of its attack mechanisms. A buffer overrun, overflow, or overwrite is a condition at an interface under which more input can be placed into a buffer or data holding area than the capacity allocated, overwriting other information. The buffer overflow type of attack has been known since it was widely used by Morris Internet Worm in 1988.

During which period did rodents, marsupials, primates, and hoofed animals first appear in north america

Answers

For the answer to the question above, I believe the answer is "Tertiary Period"
The Tertiary Period marks the beginning of Cenozoic Era. It only began 65M years ago and lasted more than 63M years, until 1.8 million years ago. I hope my answer helped you. Have a nice day!

Final answer:

Rodents, marsupials, primates, and hoofed animals first appeared in North America during the Paleocene to Eocene epochs within the Cenozoic era, with significant diversification by the end of the Oligocene.

Explanation:

Rodents, marsupials, primates, and hoofed animals first made their appearance in North America during the Paleocene to Eocene epochs within the Cenozoic era. By the beginning of the Eocene epoch, approximately 56 million years ago, we see the emergence of the first true primates and other mammalian orders. During the late Eocene, these groups started to diversify, and by the end of the Oligocene, around 23 million years ago, the first large-bodied herbivores and specialized carnivores appeared.

The paleontological evidence indicates that early forms of modern mammals including proto-primates and the ancestors to today's rodents and hoofed animals existed during these epochs. As the Eocene gave way to the Oligocene epoch, mammalian life in North America began to exhibit greater variety and adaptation to their respective niches, including the evolution of various primate groups.

The myelination of central and peripheral axons occurs rapidly through the first few years of life. how can this development process explain the improved motor abilities of infants and toddler

Answers

The development of the myelination of central and peripheral axons occurs rapidly through the first few years of life due to the fact that without myelination, information about limb movement moves slowly to the CNS, and motor commands move slowly back to the muscles.

What is Myelination?

Myelination may be defined as the process through which brain oligodendrocytes produce layers of myelin that wrap around the neuronal axons and act as a layer of insulation for the transmission of electric action potentials down the neuronal axon.

Myelination is an important developmental process that begins during the fifth fetal month with myelination of the cranial nerves and continues throughout life.

Without actual myelination, information related to limb movement moves gradually to the part of the central nervous system and motor commands move slowly back to the muscles. By the time the motor command has reached the muscle, it may no longer be appropriate.

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During fertilization in multicellular organisms, a sperm cell fuses with an egg cell to form a zygote. then, the zygote begins to divide. first, one cell becomes two, then two cells become four, four cells become eight and so on and so forth until a large ball of identical cells is formed. at this point, the ball begins to change. a space forms in the middle, and the cells are pushed inward to form layers. if cell differentiation begins after this phase, what most likely triggers this process?

Answers

The process is likely to be triggered by the formation of the layers. Zygote is the structure that forms when a sperm fertilizes an egg, the zygote then divides many times by the process of mitosis to form an embryo. That is, it forms two cells, then four, then eight and so on, up to the eight stage the cells are identical and are called embryonic stem cell, which then develop into any specialized cells type by differentiation, that the growing embryo needs, such as the nerve cells, blood cells, among others.

the formation of the layers

What is the vascular ring around the pituitary gland?

Answers

Circle of Willis.

I hope this helps ^_^

Elaine feels that her life is empty. she has lost interest in career and hobbies, and she wonders if she would be better off dead. she is most likely suffering from a(n):

Answers

A mood disorder

Mood disorders are illness in which an individual experiences serious change in mood or emotions. An individual with this disorder may feel sad or empty. Depression is the common feature of mood disorder. Major depressive disorder, bipolar disorder, persistent depressive disorder and seasonal affective disorder are all illnesses under mood disorders. For the question given above, Elaine is most likely suffering from a mood disorder.






.
How do marine biomes affect temperature on land?

Currents transport oxygen and cool the air above.

Currents transport oxygen and warm the air above.

Currents transport cold and cool the air above.

Currents transport heat and warm the air above.

Answers

Marine biomes affect temperature on land, such that currents transport heat and warm the air above. Warm and cold ocean currents can affect the climate of an area along the coast if the winds blow in from the ocean. Warm ocean currents heat the air above the water and carry the warm air to the land, increasing the temperature of the coastal region. 

Answer:

Currents transport heat and warm the air above.

Explanation:

Ocean biome is a biotic community that is present in the ocean. An ocean biome is the largest biotic community that supports and allows various marine life-forms to thrive and live. An ocean biome supports all sorts of marine life-forms right from fishes to whales, along with other exotic creatures.

How does the top level of an energy pyramid compare to the bottom level of that energy pyramid?

Answers

the bottom have half has nutritional energy but as it moves up it gets lost as sun light

Answer:

The top level of an energy pyramid has minimum energy and the bottom level has maximum energy.

The producers that make food by the help of photosynthesis has maximum energy.

As the pyramid reaches the top the energy decreases as per the 10 per cent law. The top carnivores has the minimum energy.

Explain the importance of biodiversity to an ecosystem. in your answer, be sure to:

Answers

Biodiversity supports biological system efficiency where every specie, regardless of how little, all have a vital part to play. For instance, A bigger number of plant species implies a more prominent assortment of products. More noteworthy species assorted variety guarantees common maintainability for all living things.

Which vitamins and minerals promote healthy bones?

Answers

Hello!

Calcium or vitamin C is good for the bones.

hope this helps!

~Lex

Why is nitrogen essential to the growth of a fungus, but not to the spread of rust?

Answers

Without amino acids, plants cannot make the special proteins that the plant cells need to grow.

Without adequately nitrogen, plant growth is impacted negatively. With too much nitrogen, plants produce excess biomass, or organic matter, such as stalks and leaves, but not enough root structure.

Why is nitrogen useless to animals?

Nitrogen is needed both by Plants and Animals because it is the major constituent of proteins, vitamins, hormones etc.

Nitrogen is a crucially significant component of life. Every living organism including plants and animals requires nitrogen for its growth and development.

Thus, Without adequate nitrogen, plant growth is impacted negatively.

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Final answer:

Nitrogen is essential for the growth of a fungus, but not for the spread of rust.

Explanation:

Nitrogen is essential to the growth of a fungus because it is a critical component of amino acids, which are the building blocks of proteins. Fungi use proteins to carry out various cellular functions, including growth and development. On the other hand, rust is a type of fungus that primarily spreads through asexual reproduction. It does not require nitrogen for its spread because it produces spores that can be easily dispersed by wind or water.

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Both Earth and the planet Venus have a large amount of water vapor in the atmosphere, and have extensive volcanic activity throughout history. Does this observation support or disprove the inside-out model? Supports, because Venus is near Earth and would have been hit by all the same comets. Disproves, because a single observation can discredit a theory. Disproves, because data taken on Venus is not applicable to Earth. Supports, because it shows that volcanic activity may be related to water vapor.

Answers

i would say it supports the inside out model. because both planets are similar

Supports, because it shows that volcanic activity may be related to water vapor.

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