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Q.

Most distinctive feature of echinoderms is

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a

Endoskeleton

b

Water vascular system

c

Radial symmetry

d

Enterocoelom

answer is C.

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Detailed Solution

Water vascular system is the most distinctive feature of echinoderms. 

Radial symmetry is also observed in coelenterates.

Enterocoelom is also found in chordates.

Endoskeleton is also found in molluscs and chordates.

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