Unprocessed, no. There are however, several waste treatment plants which convert raw sewage into water and a filth-free mud which can be used as fertilizer.
Plants, Animals, and Bacteria
Plants never need to use oxygen because its their waste product.
They use an excretory system
Are you serious? They are called plates or dishware, just the same other human beings use.
glycerine
When they take in the Carbon Dioxide they release Oxygen, Oxygen is also a byproduct waste of photosynthesis which plants do use.
vitamins and minerals mainly
Domestication.
Farmers
The average human is to at least use or waste over a whole tree or more!!
yes but it smells pretty bad and is harmful to the environment.
The bacteria feed on the waste and use the oxygen. (Straight from a Science Book.)