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vestigial structures!! whales have a bunch of vestigial structures similar to those found in their land-living ancestors.

(vestigial structures- a structure in an organism thst has lost all or most of its original function in the course of evolution)
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Goliath17
They slowly and gradually evolved over time from a different mammal into what they are today. Their vestigial structures (as the other person pointed out) are remnants of parts of the ancestral mammal’s body, and are proof of the evolution. The other person who answered provided a picture that displays it.

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