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Why does so much of nature rely on sex for reproduction?
Why does so much of nature rely on sex for reproduction?
Why is sex so popular among plants and animals, and why isn't asexual reproduction, or cloning, a more common reproductive strategy? Researchers recently tested a theory developed in the 1970s by John Maynard Smith suggesting that sex is a more costly reproductive strategy than asexual reproduction.
eurekalert.org




And then you introduce a selective force like a virus which will kill off all the agametically reproducing snails and just some of the gametically reproducing ones because agametic reproduction doesn't allow the mixing of genes that produce novel characteristics and so allow adaptation and evolution.