A) resistance developed after disease
B) increasing quantity of blood
C) resistance developed before disease
D) increasing rate of heart-beat
Correct Answer: A
Solution :
Immunity is described as ?active immunity? when an organism's own body manufactures its own antibodies. It may be natural (developing when organism is exposed to an infectious agent) or artificial (achieved by injecting small amount of antigen called vaccine into the body of the individual).
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