Question

Which organism has a complex nervous system?

Question 2 options:

fish

hydra

sponge

flatworm

Answer 1

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.