The first animals to have nervous system were probably similar to modern

Sponges

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Flatworms

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Cnidarians

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Annelids

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Solution

The correct option is C Cnidarians
The nervous system of animals has evolved a lot from metazoans to mammals. Cnidarians happen to have the simplest nervous system comprising mainly nerve nets. It is assumed that this is the group of animals that the modern nervous system has evolved from.
So, the correct answer is 'Cnidarians'.

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