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What is the term for the system of organs that includes the heart, blood vessels, and blood circulated throughout the entire body of a human?
What is the term for the system of organs that includes the heart, blood vessels, and blood circulated throughout the entire body of a human?
Which components make up the fluid known as blood?
Which components make up the fluid known as blood?
What is the term for the network of blood vessels that include large elastic arteries, capillaries, and veins?
What is the term for the network of blood vessels that include large elastic arteries, capillaries, and veins?
In vertebrates, does the circulatory system have an open or closed network of blood vessels?
In vertebrates, does the circulatory system have an open or closed network of blood vessels?
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Which organisms lack a circulatory system according to the text?
Which organisms lack a circulatory system according to the text?
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