Water has particular chemical properties that are important for nearly every aspect of biological life. The enzymes that act as the machinery of life only fit together properly in water. The membranes that make up cells and the organelles inside them can only exist in water. Many nutrients, and essential components of cellular processes, can only get where they need to be because they’re dissolved in water. The dissolved salts and electrolytes that participate in numerous cellular processes such as metabolism and nerve conduction and muscle contraction can only do so because they are dissolved, which allows things like concentration and voltage gradients to become important factors.
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