Viruses cannot be grown on artificial culture media because they are:

Explanation

Option C is correct. Viruses cannot be grown in anificial media because they lack metabolic machinery for the synthesis of their own nucleic acids and proteins. Facultative parasites are organisms that can live as either parasites or free-living organisms. Endoparasites are organisms that live inside the cells of their hosts. Viruses are not able to live on their own. They need to infect a host cell in order to replicate. Obligate intracellular parasites are organisms that can only live and reproduce inside the cells of a host organism. They are unable to live or reproduce on their own. Ectoparasites are organisms that live on the outside of their hosts.