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Most male mammals have testes in an external sac in order to protect their sperm from overheating. Excessive heat can impair sperm, negatively affecting fertility.

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9y ago
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9y ago

Most male mammals have their testicles on the outside of the body to aid in temperature regulation. If the testes were inside the body, sperm would become too hot and die.

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Q: Why are the testes contained in a sac?
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