I believe the answer here is D because it has a long term description of what an area is like.
WHat is the question you are asking?
Answer:
The monomers combine with each other via covalent bonds to form larger molecules known as polymers
Explanation:
I am not 100% sure but it is most likely D. Also- I like your icon
Answer: Oh boy this is a lot.
Explanation:
1. Organ
2. Nervous tissue
3. Connective tissue
4. Tissue
5. Respiratory system
6. Epithelial tissue
7. Endocrine system
8. Cells
9. Insulin
10. Homeostasis
11. Muscle tissue
12. Organ system
I hope this helps! :)