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The excretory system.
You have multiple answers....it's excretory. It's not really the endocrine system although the adrenal glands (located right on the kidney) are in the endocrine system.

There is absolutely an excretory system and it's not just the kidneys that are involved but the lungs (excrete co2) the intestines (digestive yes but also excrete waste) and obviously the kidney, bladder, ureters and urethra.
The kidneys are part of the urinary system.

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Vivien Cassin

Lvl 10
3y ago

What else can I help you with?