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Q.

Open circulatory system is found in the members of

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a

Arthropoda, Mollusca and Cephalochordata

b

Hemichordata, Arthropoda and Echinodermata

c

Nematoda, Mollusca and Urochordata

d

Annelida, Arthropoda and Echinodermata

answer is B.

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Detailed Solution

Circulatory system is of open type in the members of Hemichordata, Arthropoda and Echinodermata. 

Annelids and cephalochordates have closed circulatory system.

Circulatory system did not evolve in nematodes. It first appeared in annelids.

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