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
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.
Nitrogen is produced when the body breaks down proteins for energy.
Mainly the kidneys.
urinary
The large intestine
Urine and Stool
Vacuoles merge with the cell membrane and then open