I’ve always wondered how eyes evolved.
You need an optic nerve to transmit the info to the brain, but why would we evolve eyes without that, or an optic nerve without eyes. What purpose would it serve?
Maybe a random mutation led to eyes that were useless till then a nerve evolved like a million years later?
Or they both happened at the same time over a million years or so?
In: Biology
Eyes and other sensory organs have actually tended to evolve before the brain, rather than vice versa. If there was no sensory information to process, you wouldn’t need the brain.
In any case, the basic most part of photoreception is to have a protein that reacts to light. After that it’s quite similar evolution to other senses and organs.
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