You could say atoms or elements. You could say organic compounds. That would be a better response I guess.
Organic compounds come from living things.
A pretty big question, kind of philosophical. In just a second we'll review some of the dudes who were among the first to study cells. In order for any of these guys to make any observations or discoveries, there had to have been certain technological tools available to them. The biggest of these tools was certainly the compound light microscope. To look at that now, click here .