Question

hind limb buds disappear in whale embryos as they develop. how does this provide evidence for the ancestry of whales?
o it indicates that whale embryos develop structures that are not needed.
o it suggests that ancient whales once had functional hind limbs.
o it shows that whales are unrelated to any land - dwelling species.
o it provides evidence that whales are of the same species as fishes.

Explanation:

Embryonic development can reveal evolutionary history. The presence and subsequent disappearance of hind - limb buds in whale embryos suggest that whales' ancestors had hind limbs. This is a vestigial structure in embryonic development, indicating an evolutionary link to ancestors with functional hind limbs.

Answer:

It suggests that ancient whales once had functional hind limbs.