Species (John Wilkins, Evolving Thoughts)

i-50d0a4535967fd8c1bff72d4330598c0-bcevolutionface.jpg"Species: A term which everybody thinks they understand, but which nobody agrees upon, to denote the "basic units" of groups of biological organisms. It is sometimes said, or has been said to me, that one ought not know too much about a topic if you are to define it clearly. "

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