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Edward Jenner to find out the efficacy of vaccination used

A. his own body

B. his friend's body

C. a corpse

D. a laboratory animal

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  18. The enzyme that is necessary to bring about clotting of blood is
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  20. Hypogeal germination is found in
  21. If a father has blood group A and the mother has blood group 0, which one of the blood groups may be…
  22. Biological control is to check growth of
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  26. The hormone which is Popularly called as stress hormone is
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