All Animals, Whether Large or Small, Have

Question

All animals, whether large or small, have
A) an external body surface that is dry.
B) a basic body plan that resembles a two-layered sac.
C) a body surface covered with hair to keep them warm.
D) the ability to enter dormancy when resources become scarce.
E) each living cell in contact with an aqueous medium.

Accepted Answer

All animals, whether large or small, have each living cell in contact with an aqueous medium. This is because all cellular processes in animals occur in an aqueous environment, and therefore all animal cells are surrounded by or bathed in an aqueous fluid.

Note: Options A, B, C, and D are incorrect because they are either untrue or not applicable to all animals.