Fact 1: Nephrons are the structural and functional units of the kidneys.

Fact 2: Mammalian kidneys form urine in nephrons.

Given the two facts above, answer the question "Where do mammals make urine?" with the following options: 
- Kidneys
 - liver
 - alveoli
 - bladder
 - liquid
 - organ
 - toilets
 - sweating


 

 Kidneys        