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Q&A Why would an animal need six legs?

And I'm not talking about insects. In what kind of environment could a large number of different species all develop six legs/limbs/appendages the same way most vertebrate species on Earth have fou...

3 answers  ·  posted 8y ago by Z.Schroeder‭  ·  last activity 8y ago by Z.Schroeder‭

Question biology evolution xenobiology