Final answer:
Most of our body water is lost in urine. The kidneys regulate water levels in the body by adjusting the concentration of urine to conserve water when dehydrated or excreting dilute urine to remove excess water.
Step-by-step explanation:
Most of our body water is lost in urine. Each day, about the same volume of water that is taken in leaves the body through various routes, with the majority being excreted as urine. The kidneys play a crucial role in regulating water levels in the body by adjusting the concentration of urine to conserve water when dehydrated or excreting dilute urine to remove excess water.