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.
Photo Credit Jupiterimages/Goodshoot/Getty Images. Your body needs a certain amount of electrolytes, particularly sodium, potassium, magnesium and calcium, which must be replenished after losing them through your sweat or urine. However, you can get too many electrolytes by drinking too many sports drinks.