During the course of evolution, a closed circulatory system first appeared in phylum
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a
Arthropoda
b
Annelida
c
Platyhelminthes
d
Aschelminthes
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.