Idiom
To play second fiddle

To do back seat driving
To be happy, cheerful and healthy
To reduce importance of one's senior
None of these
To support the role and view of another person

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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
The antibodies utilized in active immunity are acquired from another organism
Immunological memory is established by passive immunization
Active and passive humoral immunity are both mechanisms of adaptive immunity that useantibodies

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