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Q.

During the course of evolution, a closed circulatory system first appeared in phylum

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a

Aschelminthes

b

Annelida

c

Platyhelminthes

d

Arthropoda

answer is B.

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Detailed Solution

A closed circulatory system is first appeared in phylum Annelida. Circulatory system is absent in Platyhelminthes and Aschelminthes. Arthropods have an open circulatory system.

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During the course of evolution, a closed circulatory system first appeared in phylum