You are presented with the question "Where do mammals make urine?" and the following answer choices: 
- Kidneys
 - liver
 - alveoli
 - bladder
 - liquid
 - organ
 - toilets
 - sweating

Now knowing that nephrons are the structural and functional units of the kidneys and mammalian kidneys form urine in nephrons, choose the best answer.


 

 Kidneys        