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a
Annelida and Arthropoda
b
Annelida and Chordata
c
Echinodermata and Hemichordata
d
Urochordata and Cephalochordata
answer is B.
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Detailed Solution
The closed circulatory system is present in Annelida and Chordata. Arthropoda, Echinodermata, Hemichordata and Urochordata exhibit open circulation.Cephalochordata shows closed circulation.