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。
A mating system is a way in which a group is structured in relation to sexual behaviour. The precise meaning depends upon the context. With respect to animals, the term describes which。
Since the beginning of life in the sea, adaptation has taught animals to establish relmatingationships with other beings. No one on the planet wants to be forever alone, and all。
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乳頭・乳首は、乳輪という周囲の色素が濃い部分に囲まれていますが、乳輪の大きさが小さいと、乳頭が相対的に大きく見えることがあります。 これは視覚的な錯覚の一種で、実際の乳頭の大きさとは異なる印象を与えることがあるので。
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