Why is circulatory

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Why is circulatory system also known as transport system
https://why-is.org/circulatory/system-also-known-as-transport-system/
Why is circulatory system called the transport system of the body
https://why-is.org/circulatory/system-called-the-transport-system-of-the-body/
Why is circulatory system known as transport system
https://why-is.org/circulatory/system-known-as-transport-system/