Why the norm of nature is 2 eyes?(except insects). Why not four, or just one?

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From whales to a frog the size of a fingernail, always two eyes.

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Anonymous 0 Comments

Having one eye allows you to see two dimensions. Having a second eye allows you to perceive depth, a third dimension. Given there are no more spacial dimensions, there is not much advantage for most creatures to have more eyes.

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