What is the only animal group that evolved to live on land and then back to live in the ocean?

What is the only animal group that evolved to live on land and then back to live in the ocean?

Correct Answer: mammals
birds
amphibians
reptiles

Explanation: Mammals are also the only animal group that evolved to live on land and then back to live in the ocean. Whales, dolphins, and porpoises have all adapted from land-dwelling creatures to a life of swimming and reproducing in the water ( Figure below ). Whales have evolved into the largest mammals.

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