What is considered the missing relation between living and non-living entities?

What is considered the missing relation between living and non-living entities?
Prions, viroids, and viruses
that missing relation would be: the cleaner uppers, ants, roaches, silverfish and other disgusting pests that hang around and verbs up your eco-waste.
teehee
You know, with adjectives these questions of yours, I construe you may be doing your homework and need answers!