A member asked:

How does alternative fertilization actually work? and do sperm and eggs always have to be involved to make babies?

A doctor has provided 1 answer

No sperm, no egg: No sperm, no egg, no human possible. In vitro fertilization creates embryos that are created from the mixing of human eggs and sperm outside of the body. Embryos are then implanted in a woman's uterus. More about how babies are made https://www.babycenter.com/getting-pregnant-sex

Answered 5/3/2017

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What shuld be the normal motility of the sperm to fertilize the egg?

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