Idiom
The detective left no stone unturned to trace the culprit.

did very irrelevant things
resorted to illegitimate practices
used all available means
took no pains

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Idiom
Select the correct statement about active and passive immunity.

Immunological memory is established by passive immunization
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
Active and passive humoral immunity are both mechanisms of adaptive immunity that useantibodies

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