a tiny living thing that causes diseases A. infect ...

[ Vocabulary ]

a tiny living thing that causes diseases

A. infect

B. immune system

C. vaccine

D. virus

Select your answer:

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Antonyms Abstract vs. Concrete Some vs. Any Gerunds/Infinitives Adverbs or Adjectives Grammar & Vocabulary Simple, Compound, Complex Sentences Mixed Tenses Correlative conjunctions

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