+Excretion is the vital process by which living organisms eliminate metabolic [Waste](/wiki/waste) products and other unwanted substances from their bodies. This fundamental function, linked to [Metabolism](/wiki/metabolism), maintains internal balance and is essential for survival.
+## See also
+- [Digestion](/wiki/digestion)
+- [Respiration](/wiki/respiration)
+- [Kidney](/wiki/kidney)