Nerve cells do not occur in

Nematodes

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Mosquitoes

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Sponges

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Coelenterates

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Solution

The correct option is D Sponges
A. Nematodes (phylum Aschelminthes) have a nervous system with circumcentric rings and nerve cords.
B. Mosquitoes (phylum Arthropoda) have a well developed nervous system.
C. Sponges (phylum Porifera) are the only animals that do not have nerve cells.
D. Coelenterates (phylum Cnidaria) don't have a nervous system but non polar neurons are irregularly scattered in the body
So, the correct answer is 'Sponges'

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