Considering the relationship in the first pair, complete the second pair by using a word or group of words:
Skin : Keratin :: Blood : …………
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Solution
Answer:
Haemoglobin
Haemoglobin is a protein in your red blood cells. Your red blood cells carry oxygen throughout your body. Oxygen powers your cells and gives you energy. A low haemoglobin level may be a sign of several conditions, including different kinds of anaemia and cancer.