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18. Viruses are considered
because they can not perform the characteristics of life without a
19. Viruses are made of two basic compounds,
and a
made of protein.
20. A virus infects a cell by injecting
into a cell.

18 Viruses Are Considered Because They Can Not Perform The Characteristics Of Life Without A 19 Viruses Are Made Of Two Basic Compounds And A Made Of Protein 20 class=