Nothing alive can live in a pool of it's own waste products ... that includes the cells of your body.
R u a child? Liver , kidneys and colon
Urine is the fluid that gets rid of water, urea, and other metabolic wastes from the body. It is produced by the kidneys and eliminated from the body via the urinary system.
Digestion
The Excretory system gets rid of wastes.
Get rid of the body wastes.
The nervous system does not directly get rid of body wastes
If not, it will fester and poison your system.
Mainly the kidneys.
Nitrogen is produced when the body breaks down proteins for energy.
The large intestine
urinary
Urine and Stool