| Thank of what we need to survive, AIR, WATER, REAL FOOD. Water is of major importance to all living things up to 60 percent of the human body is water, the brain is composed of 70 percent water, and the lungs are nearly 90 percent. About 83 percent of our blood is water, the cells are full of water, which helps us digest our food, transport waste, and control temperature. Each day humans must replace 2.4 liters of water through drinking and the rest absorbed from foods. USGS SCIENCE FOR A CHANGING WORLD |
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