Idiom
He struck several bad patches before he made good.

Went through many illness
came across bad soil
Had a bad time
Had many professional difficulties

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Idiom
Select the correct statement about active and passive immunity.

Active and passive humoral immunity are both mechanisms of adaptive immunity that useantibodies
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

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