There is a beginning of centralized nervous system in one of the followings:
Correct answer: C. Planaria
- A. Hydra
- B. Jelly fish
- C. Planaria
- D. Cartilaginous fish
Explanation
Planaria show the early centralization of the nervous system through anterior ganglia and longitudinal nerve cords. Hydra and jellyfish have diffuse nerve nets, whereas cartilaginous fish represent a much later stage.
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