What is the significance of the allocation of which organs in animals perform this function?

The function of the excretory system in animals is to rid the body of metabolic products that are harmful and toxic to the animal. First of all, these functions are performed by the urinary system. The kidney, as the main organ of this system, filters the blood from toxins, forms urine and excretes it through a tube system into the ureter and then into the bladder. The intestine, like a kidney, collects toxins and metabolic waste products, removes them in the form of feces into the external environment.