The fossil record suggests that whales ________.
A)are descended from one branch of marine reptiles
B)are closely related to land mammals such as pigs,hippos,and cows
C)are not closely related to dolphins and porpoises,despite a superficial similarity
D)once had well-developed hind flippers

Question

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The fossil record shows that whales are closely related to land mammals such as pigs, hippos, and cows. This is supported by genetic evidence as well.

The Fossil Record Suggests That Whales ________