In your explanation, include: Identify organs of the urinary system.
Relate the organs with their
functions.
• The material this system uses to
maintain balance in the body.

The kidney is an organ that is part of the urinary system.

Explanation:

The kidney's function is to filter out waste from your blood. It requires water and your blood to maintain balance in your body. The waste from your blood and the water will go out as urine.

the answer would be..

b. sucking