Final answer:
The waste material liquid formed in the kidneys is called urine. It is produced through filtration and contains excess water, salts, urea, and other toxins.
Step-by-step explanation:
The waste material liquid that is formed in the kidneys is called urine. Urine is produced through a process called filtration in the kidneys. The kidneys filter waste products from the blood, including excess water, salts, urea, and other toxins. These waste products are then expelled from the body through the urinary system as urine.
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