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. When the police came, thieves took to their heels.

took to flight
unconditionally surrendered
opened indiscriminate fire
took shelter in a tall building
were taken by surprise

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Idiom
Select the correct statement about active and passive immunity.

Immunological memory is established by passive immunization
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
The antibodies utilized in active immunity are acquired from another organism

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