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Our blood is red because of the substance, haemoglobin, which is contained in our red blood cells (red corpuscles). The function of these specialised cells is to carry oxygen from our lungs to wherever it is needed in the body. They are formed in our bone marrow and the haemoglobin in them, which is made of iron and protein, becomes redder as it picks up oxygen. It loses this colour as it deposits oxygen in other cells and picks up carbon dioxide to carry back to the lungs, which is why some of the blood vessels in our hands and arms appear blue through our skin.
Teachers expect more attractive children to perform well, leading to more attention, less punishment, and better grades.
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