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. I am sure he means business.

is earnest
is a trader
is inquisitive
is fool

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Idiom
Select the correct statement about active and passive immunity.

Active and passive humoral immunity are both mechanisms of adaptive immunity that useantibodies
The antibodies utilized in active immunity are acquired from another organism
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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