Which organisms feed on host organisms, causing them harm?

1. "i need to create calories."

2. my friend sitting next to me.

3. answering questions on

4. the show dynasty.

5. 4: 20.

6. 3: 44

7. my friend watching netflix.

8. walking from the car to my friend's house.

9. yes.

10. some.

11. 2 minutes ago.

12. when i wrote "i need to create calories."

12. sea-foam paint.

answer; i believe its the red blood cells; plz check first good luck