Which of the following best describes a adaptation brought about by natural selection

I'm not sure what the answers are but

Polar bears begin to eat goose eggs as a way to survive when seals, their usual prey, are not available.

Mountain goats restrict their range to higher altitudes because of warmer low-altitude temperatures.

Snowshoe hares change their fur from white to brown to match their warm summer habitats.

Early humans learn to make tools like flint arrows and knives to help them hunt more efficiently.

if these are your options then the answer is

C) Snowshoe hares change their fur from white to brown to match their warm summer habitats.

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.