3 ms·
Unless it wasn't selected for in humans. Or any great apes. But perhaps in a much older mammalian ancestor. And in humans it simply has not been selected agains
by bh42222 15y ago
Unless it wasn't selected for in humans. Or any great apes. But perhaps in a much older mammalian ancestor. And in humans it simply has not been selected against, which is why it's simply not as good or useful as it used to be. Sort of like wiggling your ears.