why do all of these animals have white fur?

a. white fur animals survive in an arctic environment, so animals with white fur are more likely to pass on their genetic traits than other animals.

b. white fur animals survive in an arctic environment, so animals will lighten their fur color as the seasons get colder from autumn to winter.

c. all animals that live in an arctic environment are part of the same overall kingdom, and all members of that kingdom must have white fur.

d. all animals that live in an arctic environment are part of the same overall species, and all members of that species must have white fur.