Could somebody point me to an evolutionist?

[Peter Dudey, Order of the Golden Parentheses]

If there's a more specific newsgroup for this question, kindly direct me there.

Can somebody give me a (nice, low-level; I'm not in this field) explanation of
the evolution of 

a) symbiotic behavior, e.g., "cleaner" fish, and
b) genders?

Thanks.

-- 
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