Q.

A closed circulatory system first appeared in the phylum

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a

Annelida

b

Arthropoda

c

Aschelminthes

d

Echinodermata

answer is A.

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Detailed Solution

A closed circulatory system first appeared in the phylum Annelida. The circulatory system of arthropods and echinoderms is of open type. Circulatory system is absent in Aschelminthes.

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