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Which of the following groups of animals do not possess a nervous system?

Biology
WAEC 2017

Which of the following groups of animals do not possess a nervous system?

  • A. Porifera
  • B. Cnidaria
  • C. Platyheminthes
  • D. Nematoda
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Correct Answer: Option A
Explanation

Porifera are 'pore bearing' organisms, commonly known as sponges, are the only multicellular organisms without a nervous system. Their response to stimuli is by a contraction in their bodies.

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