Why are viruses labeled as parasites/pathogens

Parasites are part of a large group of organisms called eukaryotes. Parasites are different from bacteria or viruses because their cells share many features with human cells including a defined nucleus. Parasites are usually larger than bacteria, although some environmentally resistant forms are nearly as small.

Explanation:

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the answer is third world countries, take for instance china, they restricted each family with only one child,

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it has one origin of replication, but it proceeds in two directions - d)