These useless leg bones are vestigial structures. It was believed that the only vertebrates existing were water creatures. Over time, they developed hips and legs as they eventually walked out of the water which later evolved to land creatures. Some of these are mammals, and they later moved back to the water. Biologists believe this to have occurred 50 million years ago.
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De answer is A!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Answer:
parent cell diploid cells
Explanation:
