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S. Ahmadi

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can Evolution explain why all species are happened in pair (male & female)?

according to evolution theory how all spices are pair?
why all spices are not in same gender?
have Evolution any reply for this? it yes, how much that reply is valid?

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  • May 17 2011: Many animal and other species have a male-female reproduction system because this is what evolved early on in the tree of life. It is s synapomorphy (meaning a shared trait) of all the species that have evolved after the first species that had male and female sexual reproduction. Of course, some species we see today have diverged from this ancestral character state, such as the ones mention by Lynn.

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