The large intestine of the alimentary canal or digestive system absorbs water from the remaining indigestible food matter and transmit the useless waste material from the body.
The urinary system includes the kidneys. The kidneys filter out and reabsorb nutrients such as glucose and electrolytes, while allowing waste products such as salts, some amino acids, ammonia and byproducts of bile to be excreted from the body as urine.
The lungs, part of the respiratory system expel carbon dioxide from the body as a waste byproduct of respiration.
Waste (feces) of the digestive system is from food we eat.
Urine is principally made of water that we drink.
Carbon dioxide is a waste byproduct of cellular respiration in our bodies that is fueled by the oxygen we breathe in.