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16-09-2020
Biology

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the circulatory system is responsible for transporting oxygen and nutrients throughout the bloodstream the circulatory system is what level

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18-09-2020

Answer: Inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood.

Explanation: A protein called hemoglobin in the red blood cells then carries the oxygen around your body.

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