Question

which of the following microorganisms reduce only in the cells of host organism? ​

Answer 1

Answer:

Viruses

Explanation:

They need a host organism to survive in.

Example: the novel coronavirus

Answer 2

Answer:

Host. An organism that is infected with or is fed upon by a parasitic or pathogenic organism (for example, a virus, nematode, fungus). ... An animal or plant that nourishes and supports a parasite; the host does not benefit and is often harmed by the association.