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Q.

What is the symmetry of echinoderms?

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a

Radial symmetry

b

Asymmetrical 

c

Both A and B

d

None of these

answer is A.

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Detailed Solution

Echinoderms (starfish, sea urchins and their allies) are an exception; all modern species exhibit pentaradial (five-fold) symmetry, but the phylum also possesses an in-depth fossil record that includes bilateral, asymmetrical and radial forms.

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