Final answer:
Urine is produced by the kidneys as a waste product and is eliminated from the body. Astronauts in space drink recycled urine due to limited water supply. Drinking more water leads to increased urine production.
Step-by-step explanation:
Urine is produced by the kidneys as a waste product. The kidneys filter waste products from the blood, including excess water and other substances, and eliminate them as urine. The amount of urine produced depends on the amount of fluid in the body. Drinking more water leads to a higher urine output, while dehydration leads to less urine production.
Recycled urine is used by astronauts aboard the International Space Station because water is scarce in space. Urine is purified through a rigorous process before it is consumed. This shows that if needed, water can be reused for valuable purposes.