Question

Why are viruses considered to be on the borderline of living and non-living?

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Answer 1

because in the surroundings / atmosphere the viruses act as non - living ( they exist but show no features of living thing ) but as they enter a healthy and suitable host cell they behave like a living organism and perform living processes especially reproduction due to which they infect the host . So viruses are considered to be a borderline between living and non living .
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Answer 2

because when they are in a host body they act as a living organism
and when they are outside a host cell they act as a non living
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