Moderate

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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