The hind leg bones of the whales are vestigial structures that had a function in an extinct ancestor.
Explanation:
Vestigial structures can be described as structures or features which were once useful to the ancestor of a species but currently perform no function in the body of the organism. For example, the appendix of humans.
The hind leg bones of the whales determine that their ancestor might possess these bones for walking purposes. But as the current whales do not walk, hence these structures are vestigial for the current whales.
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