Nearly 400 million years ago, the first tetrapods crawled out of the water to make a stand on dry land. But why? A 2017 study makes a startling claim: it may not have been for an abundance of food or oxygen, but visual information. In the air, you can see much further than you can in water, and that can mean everything for the survival of a species.
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Written by Ashley Hamer May 4, 2017
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