this post was submitted on 19 Aug 2025
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Need requires context. "if they don't have it, they don't need it to survive". And survival is conditioned upon the environment. If something emerges that exploited the blindspot, then we'd need it to survive.
What was the evolutionary pressure that caused receptor orientation to be different in cephalopods that vertebral animals didn't encounter? Or did they encounter it and have other adaptations that allowed it to deal with them.