What is the typical cell size of a protein and a virus?

answer:

a virus is an infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria. they range in size from about 20 to 400 nanometres in diameter (1 nanometre = 10-9 meters). by contrast, the smallest bacteria are about 400 nanometres in size.

explanation:

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the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.

substitution is the answer in this case