Which Mammalian Skeleton Provides an Advantage in an Aquatic Environment

Multiple Choice

Which mammalian skeleton provides an advantage in an aquatic environment?

A) A streamlined torpedo-shaped skeleton.
B) A skeleton that has elongated legs and large flippers.
C) A skeleton that allows for walking on the tips of their toes across the bottom of the ocean.
D) All of the answer choices provide an advantage in an aquatic environment.
E) None of the answer choices provide an advantage in an aquatic environment.