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Why should a person have two eyes, and not one or three, for example?
Theoretically, if the conditions on Earth were different, man could have a different appearance.
It's even possible that we might have been reptilian if the dinosaurs hadn't gone extinct. Everything would depend on the conditions.
One eye is unlikely. Almost all vertebrates (maybe even all of them) have a symmetrical body structure. At the same time, as you can see, everyone has two eyes. And this is despite the fact that a person who is blind in one eye can still navigate normally in space. Perhaps the second eye is some kind of insurance against the loss of the first in battle. But this is not accurate.