sentence2_structure: Urea<>is made<>in the liver$$$Urea<>excreted<>in urine
sentence1: The urea is formed in the liver, transferred to the blood, and then removed from the blood by the kidney and excreted with the urine.
sentence2: Urea is made in the liver and excreted in urine.
question: What is made in the liver and excreted in urine?