Active immunity development is related to A. Natural killer cells B. Memory cells C. Helper T cells D. Suppressor T cells
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About how much blood is in the circulatory system of an average person? A. 1 litre B. 2 litres C. 5 litres D. 10 litres
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A detritivorous animal of economic importance is (a) Caterpillar larva (b) Leech (c) Earthworm (d) Giriraja fowl
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A biological catalyst is essentially (a) An enzyme (b) A carbohydrate (c) An amino acid (d) A nitrogenous base
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What is the function of the nervous system in a frog?
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