Sexual reproduction exists solely as a means to defeat...

Sexual reproduction exists solely as a means to defeat parasites. By mixing male and female genes, sex produces offspring not exactly like either the male or female—making each generation different from the last, and presenting a moving target to intruders intent on compromising this system. … Even with this variation, parasites continue to pose a threat... and parasitism evolves and moves through any system—not just living things. The less variation there is in a system, the more readily parasites will evolve to infest it...

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