Answer:
A. Filtering Blood to Remove Unwanted Waste
Explanation:
Excretory system is comprised of Kidneys, liver, lungs and skin.
Answer:
C
Explanation:
Unrealistic means not realistic, or that it probably won't happen. If you set unrealistic goals, you will get discouraged and stop doing it because you probably won't be able to.
Those two are the muscular system and the excretory system because you use your muscles to push up and down and your excretory system produces the sweat you use while doing them
