The simplest type of nervous system in the form of network of neurons is present in which of these lower organisms?

sycon

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hydra

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earthworm

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cockroach

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Solution

The correct option is A sycon
The second type of water-current system found also in calcareous sponges, is at first characterized by choanocytes that surround fingerlike projections of the sponge wall. So the correct option is ' sycon'.

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