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Question

Open type of circulatory system is found in

A
Annelida and Arthropoda
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B
Mollusca and Annelida
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C
Arthropoda and Hemichordata
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D
Chordata and Hemichordata
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Solution

The correct option is C Arthropoda and Hemichordata
Open type of circulatory system is found in Arthropoda, Mollusca and Hemichordata.

In an open type of circulatory system, the blood flows through open sinuses and blood vessels are poorly developed.

The members of Annelida and Chordata have a closed circulatory system wherein the blood flows through closed blood vessels.

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