Which of the following statements is correct?

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(D) $1$. Open circulatory system: In this system,blood is pumped out of the heart into open spaces or body cavities called sinuses. This is found in a

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All of the above are correct.

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(D) $1$. Open circulatory system: In this system,blood is pumped out of the heart into open spaces or body cavities called sinuses. This is found in arthropods and most molluscs.$2$. Closed circulatory system: In this system,blood is circulated through a series of vessels of varying diameters (arteries,veins,and capillaries). This is found in annelids and chordates.$3$. Stroke volume: During each cardiac cycle,each ventricle pumps out approximately $70 \ ml$ of blood,which is defined as the stroke volume.Since all the statements provided are scientifically accurate,the correct option is $D$.

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