What is the main function of the urinary system? A
It keeps your body hydrated.
B.
It expels water from your body.
С
It removes poisons from your body.

C

Explanation:

The urinary system is used to expel waste and other stuff from your body that may cause harm to the body

answer; /// i believe that the correct answer is (c); ///when the lungs expand, they fill with air from the atmosphere;