The presence of pelvic bones in a whale suggests that
a whales once had legs,
b whales once lived on land.
с
whales are descended from other sea life that used
legs to swim.
whales are descended from land-dwelling
d
ancestors that had legs.
The ancestors of whales once walked on land, majority of mammals came from land even if they have a large dependent on water to survive they evolved to survive underwater and hold their oxygen for a long time.
