28 February 2020 3 5K Report

Virus is harmful for a host of organism from microgram to vertebral animal. Here, I want to ask a question, why they exist in ecology system? And why doesn’t became extinct in thousands of years nature selection? And I want to provide a question, if we could know the reason that virus keep evolution as far as possible, whether it can better help us combat and prevent the negative effects of viruses on humans?

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