Viruses? living or not? if we use the image as an indicator, we might say living because
a) proteins are present
b) it contains a nucleic acid
c) there is a complex structure
d) in a host, it is capable of reproductions

Its D

Explanation:

Viruses are not living things. Viruses are complicated assemblies of molecules, including proteins, nucleic acids, lipids, and carbohydrates, but on their own they can do nothing until they enter a living cell. Without cells, viruses would not be able to multiply.

a- all cells come from pre-existing cells