The answer that describes the question above is viruses because they are the one that inhabits the biological entities’ gray area in which falls between the living and non-living. Specific examples are organelles, plasmids or even the endosymbionts in which they inhabit.
Virus falls on the gray area which is between nonliving and living things.
Virus is referred to as the small infectious agent which replicates only inside the living cells. Virus can infect life forms plants and animals and microorganisms, for example, archaea and bacteria.
They live in form of independent particles which are referred to as virions. Some viruses can evolve from plasmids.
