Q.

The closed circulatory system is present in

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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.
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