Invisible wrote:

> Sure, by no means all animals use chromosomal sex determination.
> 
> Crocodiles use the temperature of the eggs during their development, for 
> example. I'm told there's a species of Gobi (that's a fish) that are all 
> born male, and all grow up to be female. And let's not even get into the 
> number of animals which are simultaneously male *and* female... It's a 
> weird, weird world out there!

And what we miss from all this variety is the thing in common: 
Virtually all multicellular life reproduces sexually at some phase.

Regards,
John

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