Oxygen is carried to the body's cells in the blood by the protein [[1]], which is found in red blood cells.

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answer is HEMOGLOBIN.

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Detailed Solution

Oxygen is carried to the body's cells in the blood by the protein hemoglobin, which is found in red blood cells. Hemoglobin is rich in iron.

Hemoglobin is a protein found in red blood cells that carries oxygen from the lungs to the rest of the body. It is made up of four protein molecules (globulin chains) bound together, and each globulin chain contains an iron atom. The iron in hemoglobin binds to oxygen molecules, allowing hemoglobin to transport oxygen from the lungs to the cells in the body where it is needed. This process of oxygen binding and transport helps to maintain the body's supply of oxygen, which is essential for normal cellular function.

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