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Biologically, why does a large percentage of nature have symmetry?

Asked by jackm (6212points) February 4th, 2010 from iPhone

Specificaly, most life forms show horizontal symmetry. Is there a biological or evolutionary explaination for this?

I could only think that DNA may save space by recording only half of the body and then duplicating it. ( I know our insides aren’t perfectly symmetrical, but you get the point)

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