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More than 550 million years ago, the oceans were teeming with flat, soft-bodied creatures that fed on microbes and algae and could grow as big as bathmats. Today, researchers at the University of Cali...
Around 390 million years ago, the first vertebrate animals moved from water onto land, necessitating changes in their musculoskeletal systems to permit a terrestrial life. Forelimbs and hind limbs of ...

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