In which of the following animal phyla is the | vedclass

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(A) In the phylum $Arthropoda$,the circulatory system is of the open type. In an open circulatory system,blood is pumped out of the heart into blood s

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Arthropoda

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(A) In the phylum $Arthropoda$,the circulatory system is of the open type. In an open circulatory system,blood is pumped out of the heart into blood spaces or sinuses called $haemocoel$. Because the blood is not confined to vessels,it flows at a low pressure,the volume of blood is relatively high,and the flow is irregular as it bathes the tissues directly.

In which of the following animal phyla is the blood volume high,pressure low,and flow irregular?

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