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Leukemia is a cancer of the blood/bone marrow.
Hence the keyed answer is Blood.
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Jaundice relates to bilirubin handling by the liver.
So the correct answer is Liver.
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Hemoglobin's main role is transportation of oxygen in blood.
Hence the keyed answer is Transportation of oxygen.
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Zinc deficiency can cause poor appetite and growth failure.
So the correct answer is zinc.
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Leukocytes (white blood cells) defend against infection.
So the correct answer is Leukocytes.
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According to the keyed answer, the major part is methane.
Editor note: overgeneralized across fuels; options left unchanged.
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