What is haemoglobin
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Haemoglobin (Hb) is a protein present in red blood cells that transports oxygen and gives blood its dark/vivid red color. The amount of haemoglobin in the blood varies from person to person. Men's levels are often greater than women's. This is scientifically proven however, it is often but not all the time.

Haemoglobin is a red protein found in red blood cells that binds to oxygen allowing red blood cells to carry and transport oxygen around the body

answer; /// i believe the correct answer is (reactants);

d) center of the mid-ocean ridge

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