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What is a muscle? Biology and Evolution

By |2017-05-26T23:42:02+00:00May 26th, 2017|Biology|

A black woman shows off her muscles One-celled creatures don't have any muscles; the ones that can move themselves use flagellae instead. Even after living creatures evolved that had a lot of cells, the early ones like hydras and sponges couldn't move. The earliest creatures that had muscles and could move on their own [...]