Enzymes are protein macromolecules.
Answer:
1. Sewage
2. diarrhea
3. atmosphere
4. 100 gallons of water
5. agricultural pollution
6. water cycle
7. water
Explanation:
Fill a graduated cylinder to 10mL, place the rock inside and calculate the difference in mL.
That would be the Endocrine system which secretes hormones into the blood through glands