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Which one of the following animals has a nervous system but no brain?

1. Earthworm
2. Hydra
3. Amoeba
4. cockroach

Correct answer: Hydra

Solution

Hydra is a cnidarian and has a diffuse nerve net, so it can respond to stimuli without a true brain. Earthworm and cockroach have more centralized nervous systems, while Amoeba has no nervous system at all.

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