I’ll try and help you, but idk what’s with the full on list on top XD.
So for the final question, I think it’s viruses de not take in nutrients. But, the thing is, no one really knows if they are non-living or living organisms. This is the thing, there are come “requirements” for something to be an organism. They are: composed of cells, can reproduce, a able to have a metabolism, growth and development, adaptation through evolution (giving them traits and behaviors), respond to stimuli, are able to have homeostasis, and having genetic material.
Viruses on the other hand, have some of these traits. They do have genetic material but they don’t have a nucleus. Meaning they don’t have a thinking organ or a control station like cells have. Viruses do also respond to respond to stimuli and they do reproduce but in the weirdest way. They have to enter a cell, literally hack it’s system, to then reach its nucleus, to then hack it and obligate it to only replicate the virus by making their RNA enter the nucleus. They hack into the cell with protein “keys” to enter the cell membrane and make the cell transport it to the nucleus.