Define the term excretion.
Solution
Excretion is the process by which waste products of metabolism and other non-useful materials are eliminated from an organism. This is an essential process in all forms of life. In mammals like humans, this includes substances like urea (from the metabolism of amino acids), excess salts and water that the body doesn't need. The organs involved in this process are known as the excretory system. The main excretory system in humans is the urinary system.
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