Possible answers: A. Kidneys; B. liver; C. alveoli; D. bladder; E. liquid; F. organ; G. toilets; H. sweating;

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, where do mammals make urine?
Answer:
A.