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Open circulatory system is found in the members of

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Annelida, Arthropoda and Echinodermata

Hemichordata, Arthropoda and Echinodermata

Arthropoda, Mollusca and Cephalochordata

Nematoda, Mollusca and Urochordata

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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