Idiom
Harassed by repeated acts of injustice. he decided to put his foot down.

not to yield
to accept the proposal unconditionally
withdraw
resign

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Idiom
Select the correct statement about active and passive immunity.

Immunological memory is established by passive immunization
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

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