Skeletons of Modern Cetaceans Have Remnants of a __________

Question

Skeletons of modern cetaceans have remnants of a __________.  
A) rib
B) head
C) flipper
D) pelvis
E) spine

Accepted Answer

The pelvis is a vestigial structure in modern cetaceans, meaning it is a remnant of their evolutionary ancestors who had functioning pelvic bones. The pelvis in modern cetaceans serves no functional purpose and is only present as a leftover from their evolutionary past on land.