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'''Urine''' is liquid biological waste excreted by the [[kidney]]s. The [[human]] body produces urine, as do all [[mammals]], [[reptile|reptiles]], [[birds]], [[fish]], and [[amphibian|amphibians]]. Urine is mostly [[water]], and also contains [[urea]], [[creatinine]], waste [[enzymes]] and [[hormone]]s, [[protein]]s, [[carbohydrate]]s and fatty [[acid]]s<ref>[http://www.ivy-rose.co.uk/Topics/Urinary_System_Composition_Urine.php Urinalysis - The composition of Urine]</ref>.

'''Urine''' is liquid [[biology|biological]] waste excreted by the [[kidney]]s. The [[human]] body produces urine, as do all [[mammals]], [[reptile|reptiles]], [[birds]], [[fish]], and [[amphibian|amphibians]]. Urine is mostly [[water]], and also contains [[urea]], [[creatinine]], waste [[enzymes]] and [[hormone]]s, [[protein]]s, [[carbohydrate]]s and fatty [[acid]]s<ref>[http://www.ivy-rose.co.uk/Topics/Urinary_System_Composition_Urine.php Urinalysis - The composition of Urine]</ref>.

==References==

==References==