Final answer:
Urine is a waste product eliminated by the kidneys, primarily composed of water, urea, and other dissolved ions and compounds. It removes waste products from the body, and any alterations in its composition can indicate disease.
Step-by-step explanation:
Urine is definitively described as a liquid waste product of the body that is formed by the kidneys and excreted by the urinary system. According to Michael McBride with Idexx, urine is A. A waste product eliminated by the kidneys. It serves several functions, including the elimination of water-soluble metabolic products such as urea and uric acid, excess water, and mineral ions. Urea, in particular, is a non-toxic molecule comprised of toxic ammonia and carbon dioxide. Urine's chemical composition is primarily water but also contains other dissolved ions and compounds. If urine's composition is altered due to an injury or infection, it can indicate disease.