Answer:
Choice A, Adhesion
Explanation:
If you have trouble telling the difference between cohesion and adhesion, remember that an adhesive is glue, water is essentially "gluing" itself to another surface.
Answer: It is important that cells have a "control system" because without it cells would either divide too fast or cause tumors to grow (cancer), or divide too slow and not be able to perform their cellular functions which is why the cells are controlled.