science

land whale science biology mammal - 7198478848
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By moving into the water full-time, the ancestors of whales paved the way for their descendants to become behemoths, largely free from gravity's constraints. Today, the blue whale is the largest animal ever to live.
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Seeing the Northern Lights is definitely up there on my list of things to do, but I guess an in-depth explanation will have to suffice for now.