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Choose the correct statements from the following.
a) Digestion is both extracellular and intracellular in sea walnuts.
b) Gills have respiratory and excretory functions in molluscs.
c) Longitudinal and circular muscles help in locomotion in earthworms.
d) Parapodia helps in respiration and locomotion in round worms.
e) Hooks and suckers are present in the parasitic forms of echinoderms.

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a, b and c only

c, d and e only

a, b only

c, d only

answer is A.

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Detailed Solution

Parapodia helps in respiration and locomotion in Nereis.
Hooks and suckers are present in the parasitic forms of platyhelminthes.

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