In which of the following is an open circulat | vedclass

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(D) An open circulatory system is a type of circulatory system where the blood is pumped out of the heart into body cavities (sinuses) called hemocoel

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(D) An open circulatory system is a type of circulatory system where the blood is pumped out of the heart into body cavities (sinuses) called hemocoel,where tissues and organs are bathed in blood.This type of system is characteristic of Arthropods (e.g.,insects,crustaceans) and most Mollusks.Annelids (except leeches) and Chordates possess a closed circulatory system,where blood flows through a series of vessels of varying diameters (arteries,veins,and capillaries).Therefore,the open circulatory system is found in Arthropoda (labeled as $1$).Thus,the correct option is $D$ (Only $a$).

In which of the following is an open circulatory system found?
$(1)$ Arthropoda $(2)$ Annelida $(3)$ Chordata

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In which of the following is an open circulatory system found?$(1)$ Arthropoda $(2)$ Annelida $(3)$ Chordata