Idiom
For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. To hit below the belt

To work confidentially
To hit the correct mark
To strike at the exact position
To harm unfairly

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Idiom
Select the correct statement about active and passive immunity.

The antibodies utilized in active immunity are acquired from another organism
Active and passive humoral immunity are both mechanisms of adaptive immunity that useantibodies
A vaccination is an example of the introduction of passive immunity into the body
Immunological memory is established by passive immunization

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