How can viruses duplicate themselves?

Answer 1

Viruses are noncellular genetic elements that use a living cell for their replication and have an extracellular state. Viruses are ultramicroscopic particles containing nucleic acid surrounded by protein, and in some cases, other macromolecular components such as a membranelike envelope.

Answer 2

it has written it to its code a method of spread like how cold are spread through the air virus can be spread be emails. some virus don't have this code like if you download some thing. its means of transmission is by the thing you down load and cant be spread unless shared.

Answer 3

Viruses can duplicate themselves because of the code that is written into the virus. Viruses are designed often times and self replicate so that they are hard to get rid of. People that write viruses have nothing better to do with their time it seems and they want to cause damage. If the virus keeps duplicating itself, it can do more damage then it would if it ran only once.