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Question

Nerve cells are not found in

A
Platyhelminthes
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B
Coelenterates
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C
Echinoderms
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D
Sponges
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Solution

The correct option is D Sponges
Sponges are the only multicellular animals without a nervous system. They do not have any nerve cells or sensory cells. However, touch or pressure to the outside of a sponge will cause a local contraction of its body.

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