Which of the following is absent in echinoderms?

Nervous system

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Muscular system

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Cephalisation

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All of the above

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Solution

The correct option is D Cephalisation
Echinoderms have a simple radial nervous system, that consists of a modified nerve net consisting of interconnecting neurons with no central brain. While cephalisation is a process of brain formation.
So, the correct option is C.

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