Bot GPT 4-o mini Among the options provided, fish have a complex nervous system. Fish possess a well-developed brain and spinal cord, along with peripheral nerves, which allow for advanced sensory processing and motor control.
Hydra, sponges, and flatworms have simpler nervous systems, with sponges lacking a nervous system entirely, hydra having a nerve net, and flatworms having a more primitive structure, but still simpler than that of fish.
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