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I know they don't have nervous systems. The question is why they ddnt need one. They do after all react to the environment. When giraffes eat acacia leaves they even release that info to other trees nearby with ethylene gas! This is pretty advanced, as is the 'root internet'
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Feels like you’re thinking about evolution wrong. Pain is selected for as a trait if even slightly useful. It may become less useful or a spandrel if other adaptations drive trade offs like a heavy shell. Slow movement beats no movement (eg getting out of sun)
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