Question

Under what circumstances can viruses reproduce

Answer 1

We cant say if a virus is living or non living 
It has a primitive DNA and genome 
It only live on the base of host cell 
When it enters any host cell , It starts getting products from it and then reproduce 

Answer 2

Explanation:

A virus needs a living cell in order to reproduce is called a host cell. Thus, viruses are small agents that can only reproduce inside a living cell of other organism's.