BIOLOGY HIGH SCHOOL

Genes that control feather color in some animals are expressed differently in the winter than in the summer. How might such a difference be beneficial to the ptarmigan bird?

Answers

Answer 1
Answer: The relationship of the genes and the chances for survival for the ptarmigan bird n is that the genes allow it to have two colours of feathers: white in the winter and brown in the summer.

This means that the bird will be less visible to predators in the winter, as it can hide in snow but also less visible to predators in the summer, as it can hide in grass!

As a result, more individuals will escape the predators and the species is more likely to survive.

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Which of the following observations best supports the conclusion that dolphins and sharks do not have a recent common ancestor?A. Dolphins form social groups, but sharks are solitary. B. Dolphins hunt during the day, but sharks are nocturnal. C. The number of dolphin species is far less than the number of shark species. D. The jawbone structure in dolphins is very different from the jawbone structure in sharks.
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The cells in the meristematic region of the root are undergoinga. meiosis.
b. sexual reproduction.
c. binary fission.
d. mitosis.

Answers

The answer is d. mitosis.

The cells in the meristematic region of the root are embryonic cells. Thus, these undifferentiated cells have the capacity to undergo continuous mitotic divisions and divide into new cells. The meristematic region of the root contains meristem cells for the root growth.

 

Most land mammals have the ability to rest one hemisphere of their brains at a time. Please select the best answer from the choices provideda. True
b. False

Answers

Answer: b. False

Many mammals rests for a large proportion of the 24 hour. The rest period usually extent during hibernation. The marine mammals tend to rest or sleep with only one hemisphere is kept at rest. It allows them to keep one eye open this allows them to stay alert against the predators. But the terrestrial or land mammals when take rest both the hemispheres of the brain sleep.

On the basis of the above description, most land mammals have the ability to rest one hemisphere of their brains at a time is false.
The answer is false, I just took the quiz

What was the purpose of religious camp meetings in the early 1800s?

Answers

Revivals. They would gather large groups of people together and preach for lengthy periods of time, often more than three hours. These were occumpanied sometimes by odd twitchings (the holy twitches) People falling d wn and rolling on the ground, and shouting. It helped to convert People to a certain denomination, but it is important to note that mostly women attended these revivals

Because of its size, messenger RNA (mRNA) is able to exit the nucleus through nuclear pores andenter the cytoplasm where ribosomes are located true or false.​

Answers

Answer:

true

Explanation:

What is designer babies?

Answers

A designer baby is a baby who's genetic makeup have been specifically chosen to give it certain traits desired by parents.
A designer baby is a baby who has specific genes, which were chosen by someone. They make sure that the baby gets that gene. 

A runner is three quarters of the way through a marathon. Which systems are working to maintain oxygen levels for the runner's muscles?a. integumentary, excretory, nervous, endocrine
b. circulatory, excretory, nervous, endocrine
c. respiratory, excretory, nervous, endocrine
d. circulatory, respiratory, nervous, endocrine

Answers

The correct answer is D. circulatory, respiratory, nervous, endocrine 

The other systems mentioned in the first three examples don't maintain oxygen levels at that body strain level.

Answer:

option D : circulatory, respiratory, nervous, endocrine

Explanation:

The circulatory system of the body maintains the flow of oxygen, nutrients and blood in the body. The respiratory system allows the uptake of oxygen and exhalation of carbon dioxide. Thus maintaining oxygen requirement of the runner. The nervous system regulates the process of breathing in the body. The endocrine system provides signals that works together with respiratory system.

The integumentary system comprises nail, skin, exocrine glands and hairs. The excretory system involves removal of waste from the body. Thus, option D is correct.
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