The main reason why the Supreme Court case Marbury v. Madison was significant is because B. it established the power of judicial review, since this allows the Supreme Court to check the legislature. This question is archived.
Water: Why We Need It. Hydration is important because the body is comprised mostly of water, and the proper balance between water and electrolytes in our bodies really determines how most of our systems function, including nerves and muscles, says Larry Kenney, PhD, a professor of physiology and kinesiology at Penn State.
Key Electrolytes in the Body. Body fluids (water) contain electrolytes. Electrolytes are salts of various types each of which play a critical role in physiology (function) and in athletic performance. The best known salt is so called table salt which is usually sodium chloride (NaCl).