Nerve cells do not occur in

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(C) Sponges (Phylum $Porifera$) are the simplest multicellular animals.They lack a nervous system,meaning they do not possess nerve cells or sensory o

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Sponges

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(C) Sponges (Phylum $Porifera$) are the simplest multicellular animals.They lack a nervous system,meaning they do not possess nerve cells or sensory organs.In contrast,$Coelenterates$ (Cnidarians) possess a primitive nerve net,and both $Nematodes$ and $Mosquitoes$ have more complex nervous systems.

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