The blood does not flow in blood vessels and circulates throughout the body is called as open circulatory system. Open circulatory system is the characteristic feature of ___________
A
Platyhelminthes
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B
Amphibia
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C
Aschelminthes
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D
Arthropoda
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Solution
The correct option is D Arthropoda In Phylum Arthropoda, body cavity is filled with haemolymph (blood). The blood does not flow in blood vessels and circulates throughout the body (open circulatory system).