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So part of the brain is in the eye? or The eye is complex so the information does not need to be processed?
I doubt that the first one is true. So if the later is true then The eye does the work of the brain. How much work does it do? Don't biologists' need to account for this if they say "something has a small brain". Is this not relative to each individual creature? Would it be better to say "This mantis shrimp has a small brain, but its relative brain size is ---cc because of the complex nature of its eyes"
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