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

Fact 2: When kidney function is normal, creatinine is removed from the body by the kidneys.

Given the two facts above, answer the question "What is required to remove creatinine from the body?" with the following options: 
- evaporation
 - adding heat
 - Dehydration
 - sleep
 - sweating
 - nephrons
 - glucose
 - hydration


 

      nephrons   