<P> Urine has a role in the earth's nitrogen cycle . In balanced ecosystems urine fertilizes the soil and thus helps plants to grow . Therefore, urine can be used as a fertilizer . Some animals use it to mark their territories . Historically, aged or fermented urine (known as lant) was also used for gunpowder production, household cleaning, tanning of leather and dyeing of textiles . </P> <P> Human urine and feces are collectively referred to as human waste or human excreta, and are managed with a sanitation system . Livestock urine and feces also require proper management if the livestock population density is high . </P> <P> Most animals have excretory systems for elimination of soluble toxic wastes . In humans, soluble wastes are excreted primarily by the urinary system and, to a lesser extent in terms of urea, removed by perspiration . The urinary system consists of the kidneys, ureters, urinary bladder, and urethra . The system produces urine by a process of filtration, reabsorption, and tubular secretion . The kidneys extract the soluble wastes from the bloodstream, as well as excess water, sugars, and a variety of other compounds . The resulting urine contains high concentrations of urea and other substances, including toxins . Urine flows from the kidneys through the ureter, bladder, and finally the urethra before passing from the body . </P> <P> Research looking at the duration of urination in a range of mammal species found that nine larger species urinated for 21 ± 13 seconds irrespective of body size . Smaller species including rodents and bats cannot produce jets and instead urinate with a series of drops . </P>

Now a part of urine urea is collected in the
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