Question

what is Virus ??? .. urgent useful ​

Answer 1

Answer:

A virus is a small parasite that cannot reproduce by itself. Once it infects a susceptible cell, however, a virus can direct the cell machinery to produce more viruses. Most viruses have either RNA or DNA as their genetic material. The nucleic acid may be single- or double-stranded.

Step-by-step explanation:

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Answer 2

Answer:

A living thing, too small to be seen without a special instrument (microscope), that causes disease in people, animals and plants

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