As breasts are designed to feed babies, why do women have two instead of just one?
In: Biology
The answer is ‘because that is how humans evolved’. People can speculate as to why evolution took that path, but for the fundamental answer is just “random mutation lead to humans having 2 breasts and that is the human that survived”.
Because for whatever reason women with 2 breasts were better at surviving than women with 1 breast or more than 2 breasts. Or maybe more accurately, the children of women with 2 breasts were better at surviving than the children of women with 1 or more than 2 breasts.
Also, for some reason almost all animals have symmetry. And at a minimum bilateral symmetry. Which means no animal would have an odd number of breasts. But again this is just a random mutation that proved to be the most likely to survive.
It makes sense that an animals that had more breasts than they did children, as the children would be more likely to survive. If they had less breasts than the number of children then some children would potentially starve. But having more breasts than needed must not have provided more of an advantage.
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