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In this article we first discuss why sexual reproduction exists, and how differences between males and females affect mating systems. We move on to consider the evolution of mate choice, and。

In mating, there are two types of selection (intersexual, intrasexual) and three mating systems (monogamous, polygynous, polyandrous).

Since the beginning of life in the sea, adaptation has taught animals to establish relationships with other beings. No one on the planet wants to be forever alone, and all。

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