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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