Which of the following phyla possess an open | vedclass

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(D) In an open circulatory system,blood is pumped out of the heart into blood sinuses (body cavities) where the cells and tissues are directly bathed

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Only $a$ and $d$

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(D) In an open circulatory system,blood is pumped out of the heart into blood sinuses (body cavities) where the cells and tissues are directly bathed in it.$1$. Arthropoda $(a)$: These organisms possess an open circulatory system.$2$. Annelida $(b)$: These organisms possess a closed circulatory system.$3$. Chordata $(c)$: These organisms possess a closed circulatory system.$4$. Mollusca $(d)$: Most molluscs (except cephalopods) possess an open circulatory system.Therefore,both Arthropoda and Mollusca exhibit an open circulatory system.

Which of the following phyla possess an open circulatory system?

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