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Which one of the following animals possesses nerve cells but no nerves?

1. Hydra
2. Tapeworm
3. Earthworm
4. Frog’s tadpole

Correct answer: Hydra

Solution

Hydra is a cnidarian, and cnidarians have a diffuse nerve net made of nerve cells rather than true nerves. The other options are more complex animals with organized nervous systems that include nerves.

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