Two kidneys filter and remove waste from the blood leaving a watery fluid left over called . saliva
saline
plasma
urine

Urine

Explanation:  

It's the first step of Glomerular filtration which is the process that your kidneys use to filter excess fluid and waste products out of the blood into the urine collecting tubules of the kidney, so they may be eliminated from your body.

b is the correct answer

answer; 4% i believe this is correct;