What is the main advantage of sexual reproduction

Diversity. The more diverse a species, the better its chances of survival are, and with sexual reproduction an organism isn't essentially duplicating itself, so it's forced to expand its gene pool.

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More variation assists with survival. It increases th chance that at least some offspring of a parent survive. It creates genetic diversity within the species. It is a rewarding experience. It can encourage the growth of brain cells. It improve health.