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Sexes evolved a billion or two years ago to increase genetic diversity so that creatures could quickly evolve to meet new challenges and invade new territory. Having two sets of genes replicated, reworked and mutated every generation provides ample opportunity for a specie to evolve out of a problem. Sexes also allow for more complicated lives because cells do not need to constantly replicate when the functionality is shared among two.

Monogamy is rare and is implemented for raising particularly needy babies that take a long time to grow or where the environment requires two (or more) adults to gather food and provide protection. A human's 13 odd year childhood is one of the longest and two parents are usually needed for a successful rearing. A gazelle on the other hand, is pretty much born ready to go, and never needs to meet the father, so monogamy is rare in Gazelles.

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15y ago
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5mo ago

Most creatures have male and female pairs because sexual reproduction allows for genetic diversity, which can increase the chances of survival for a species. This diversity helps species adapt to changing environments and resist diseases. Having separate sexes also allows for the mixing and recombination of genetic material, leading to offspring with unique combinations of traits.

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Q: Why most creatures have male and female pairs?
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