For a vaccine to produce useful protection against an infection, which of the following must a person's immune system do in response to the vaccine? Choose all that apply. Group of answer choices Some white blood cells must form memory cells White blood cells which recognize the vaccine with their antibodies must reproduce The complement system must enter a long-term activated state White blood cells which recognize the vaccine must undergo apoptosis

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Defense Mechanism

Circumstances influence and compel people to behave in a certain way. One such behavior is a defense mechanism. It is employed by people to escape from unpleasant circumstances, thoughts and actions. Defense mechanisms are, thus, psychological strategies that help to avert and avoid unwanted feelings such as guilt or shame and situations such as threat and danger.