Similar Fusiform Body Shapes Are Seen in Sharks, Penguins, and Aquatic

Multiple Choice

Similar fusiform body shapes are seen in sharks, penguins, and aquatic mammals because

A) natural selection has no limits when different organisms face the same challenge.
B) respiration through gills is enhanced by having a fusiform shape.
C) the laws of physics constrain the shapes that are possible for aquatic animals that swim very fast.
D) the fusiform shape is coded by the same gene in all three types of animals.
E) all three types evolved from ancestral forms that fly in the air.