The first central nervous system appeared in flatworms.

Name: The first central nervous system appeared in flatworms.
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Flatworms (phylum Platyhelminthes) were the first animals to evolve a central nervous system. This system consists of a simple network of nerve cells, called a nerve net, which runs through the body of the flatworm and allows it to respond to different stimuli. This basic nervous system laid the foundation for the more complex nervous systems found in later animal groups.

The First Central Nervous System Appeared in Flatworms