Why is a virus considered Non-living

A. a virus does not have a nucleus

B. a virus does not contain genetic material

C. a virus is to small to be considered a cell

D. a virus cannot reproduce itself without a host cell

A virus is considered non-living because it cannot reproduce itself without a host cell. Cells, which are considered living, use cell-division to replicate themselves. However, a virus must invade a cell in order to create more viruses, thus are not considered alive.