Based on cell theory, 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 too small to be considered a cell. eliminate d) a virus cannot reproduce itself without a host cell.

The correct answer option is D) A virus cannot reproduce itself without a host cell.

Explanation:

Viruses cannot keep themselves in a stable state as they are not made out of cells they don’t grow so they cannot make their own energy.

Though these viruses do replicate and adapt to their environment but they are are more like androids than real living organisms.  

They lack the ability of reproduction without the help of a host cell and do not use the typical cell division approach to replicate.

b. the carbon cycle ensures living things have a source of hydrogen