What was the first organism to have what we consider a true central nervous system?

Question

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Flatworms (Platyhelminthes) were the first organisms to develop what we consider a true central nervous system. They possess a pair of cephalic ganglia that function as a primitive brain and associated nerve cords that run throughout their body. This allowed for more complex behavior and movement compared to other organisms without a central nervous system.

What Was the First Organism to Have What We Consider