Which of the following groups of animals do not possess a nervous system?
A.
Porifera
B.
Cnidaria
C.
Platyheminthes
D.
Nematoda
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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