Chapter 9

Term Definition
Virus A tiny nonliving particle that invades and then reproduces inside a living cell
Host The organism that a parasite or virus lives in or on
Parasite The organism that benefits by living in or on a host in a parasitism interaction
Bacteriophage A virus that infects bacteria
Vaccine A substance used in a vaccination that consists of weakened or killed pathogens that can trigger the immune system into action
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