Idiom
At one's beck and call

To be in an advantageous position
To be always at one's service
To be under one's subjugation
Enjoying oneself without caring for others

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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
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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