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Which element in the protein hemoglobin, found in red blood cells, is responsible for binding oxygen?

A Iron
Iron is found at the center of each of the hemoglobin subunits and is responsible for ‘grabbing’ oxygen from the air in the lungs, and releasing it as it travels through your body. As a result, iron deficiency can cause a lowered level of red blood cells, and lower your ability to exercise!
B Calcium
C Magnesium
D Titanium