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. The thief took to his heels when he saw a policeman on the beat.

ran away from the scene
could not decide what to do
had some pain in his heels
confronted the policeman

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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
Immunological memory is established by passive immunization
A vaccination is an example of the introduction of passive immunity into the body

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