On Tue, 14 Oct 2003 20:43:57 +0000 (UTC), "Representative Trantis"
 wrote:

>Why did animals develop two Kidneys and two testicles/ovaries?

You asked this in sci.anthropology.paleo and I answered you there.
There is seldom any reason to post to two news groups.  And if you do,
you should learn to cross-post rather than post separate messages in
each.  That way, the answers to your questions will also get cross
posted.

[moderator's ah, but: Ah, but I frown on crossposting; I'm likely
to allow it within the sci.* hierarchy, so long as I don't step on
the toes of some other moderated newsgroup, but this question is
patently NOT specific to humans, and hence, is not appropriate for
s.a.p. I agree with other answers, however, in thinking that the
question should be, since we're bilaterally symmetrical, why are
some organs NOT duplicated (when, of course, developmentally
speaking, the heart is symmetrical to begin with, but torsion 
messes up all that lovely symmetry, for example). - JAH]
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