Which of the following groups of animals do not possess a...
Which of the following groups of animals do not possess a nervous system?
Porifera
Cnidaria
Platyheminthes
Nematoda
Correct answer is 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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