Idiom
To wrangle over an ass's shadow

To do something funny
To quarrel over trifles
To waste time on petty thing
To act in a foolish way

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Idiom
Select the correct statement about active and passive immunity.

A vaccination is an example of the introduction of passive immunity into the body
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

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