Organs of excretion make up the excretory system, and leptospiral organisms cause infection in the kidneys and are excreted in urine. Given these facts, what is part of an animal's excretory system among the following options:
- alveoli
 - garbage chute
 - pollen
 - glucose
 - bloodstream
 - kidneys
 - food
 - intake


 

      kidneys   