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A vaccine a. can be harmful because it contains pathogens such as viruses. b. contains a changed pathogen, so the pathogen is no longer harmful. c. provokes a response from the viral immune system. d.
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1 vote
A vaccine

a. can be harmful because it contains pathogens such as viruses.
b. contains a changed pathogen, so the pathogen is no longer harmful.
c. provokes a response from the viral immune system.
d. all of the above

User Marc Baumbach
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8.3k points

1 Answer

1 vote
It's B, ijust read my biology book
User Adnako
by
7.2k points
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