Penguins that are able to survive the extremely harsh winters in the icy lands of Antarctica do so by huddling together in tightly packed groups. They do this because they are depending on each other to meet their need for a certain -

a. nutritional requirement.
b. quantity of fresh water.
c. range of temperatures.
d. duration of sunlight.

C. range of temperatures.

Explanation:

To prevent themselves freezing to death, they huddle together in tightly-packed groups to conserve heat and shelter themselves from the intense winds.

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

i think that the best answer would be c.

tell me if im wrong : )