A dead version of a virus is introduced into a person. This activates the person's immune system, which learns how to fight the
virus. Years later, the person comes in contact with the virus again and does not get sick because his immune system can easily
defeat the virus. What has most likely occurred in this scenario so that the person did not get sick during the second exposure?
•The person developed a vaccine against the virus.
•The person was sick from a virus and developed innate immunity.
•The person was vaccinated against the virus.
•The person was sick from a virus and developed an immune response.
Answers: 2
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The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above
Answers: 1
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Select the correct answer. which statement applies only to the axial skeleton, not the appendicular skeleton? a. it contains a pivot joint. b. it has muscles attached that work in pairs. c. it contains red bone marrow. d. it possesses fossa for bone articulation. e. it protects the heart and lungs.
Answers: 2
A dead version of a virus is introduced into a person. This activates the person's immune system, wh...
History, 30.01.2021 22:20