Descended testicles: DNA study drops new hints on secrets of low hanging glands

Descended testicles: DNA study drops new hints on secrets of low hanging glands

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a heap of colorful balls

Keeping everything outside the body seems like a strange choice.

The scrotum is a mystery. Why do most male mammals have their reproductive glands so vulnerably located in a sack of skin and muscle outside the body?

Source: sceince

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