Q for biologists: if we have two kidneys for redundancy, why don't we have two hearts?
@psygnisfive try to take the meaning from my question that is correct. There is purpose behind most organs!
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@DanielleFong yes, but its typically a boring local phenomenon like "it was beneficial at the time, and thus preserved" -
@DanielleFong evolution probes possibilities, maximizing utility locally, so these "why" sorts of questions generally dont have good answers - 5 more replies
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