plants that are dead or decaying are used to make a special kind of manure called Compost.
The stems of these plants are dried and used as fodder called hay
a waste gas createdby cells. Used by plants to survive
Oxygen
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.
glycerine
Animal waste can help to fertilize the plants.
Plants release oxygen as a waste gas.
Carbon dioxide :)
Cocoa shells can be used for mulch for plants. Just keep pets away!
Oxygen comes out as waste product in plants during photosynthesis
Plants need Water (H2O) and Carbon Dioxide (CO2) to produce glucose - which is used as food. The hydrogen (H2) part of the water is used with the carbon dioxide to produce glucose, the food. The remaining oxygen (from the water) is waste.
Carbon dioxide. Carbon dioxide (CO2) is a waste product produced by animals (including humans of course) during respiration. Plants use this as part of the process of photosynthesis, which in turn creates oxygen (as a waste product).
sludge.