Question on: WAEC Biology - 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 Option: A
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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