Idiom
Select the correct statement about active and passive immunity.

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

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Idiom
To cool one's heel

To give no importance to someone
To remain in a comfortable position
To be kept awaiting someone
To rest for sometime

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