Cephalization is absent in

Mollusca

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Arthropods

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Both A and B

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Echinoderms

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Solution

The correct option is D Echinoderms
The development of a head in evolution is known as cephalization. It is absent in echinoderms, which although having a bilateral ancestor develop into a pentaradial animal with no concentrated neural ganglia or sensory head region. So, the correct answer is option D.

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