In whales back leg bones are a vestigial structure. What does this mean?
A The leg bones still have a use.
® The leg bones were never used.
Whales ancestor had legs.
It means that the leg bones are no longer functional or necessary for the whale's current way of life, but they are remnants of evolutionary history when ancestral whales did have legs.
Whats the answer out of the questions
The correct answer is:
The leg bones were never used. Whales' ancestor had legs.