Idiom
Despite the trust bestowed on the minister he turned out to be a snake in the grass during the revolution.

a treacherous person
an unexpected misfortune
a secret enemy
an unforeseen danger

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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
Active and passive humoral immunity are both mechanisms of adaptive immunity that useantibodies
The antibodies utilized in active immunity are acquired from another organism

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