Why Do We Need Water to Survive?

Answer

We need water to survive because we depend on it to keep our bodies hydrated. Our bodies are made up of between 50% to 70% of water and amazingly our brains comprise over 80% water. It is therefore obvious that we need to take water to keep our bodies functioning.
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1 Additional Answer
We need water to survive, to replace the water we lose through sweat and urination. The majority of our bodies are made up of water. If we didn't replace our fluids as needed, our bodies wouldn't be able to function. You can find more information here: http://www.rsc.org/Chemsoc/Chembytes/HotTopics/DrinkingWater/whywater.asp
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