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.
d) a virus cannot reproduce itself without a host cell.

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons