Water Vapor,Ozone ,Hydrofluorocarbons
Blood vessels, ligaments, muscles, and skin pigment.
Water Cycle is the answer
Hair and nails are part<span> of the integumentary </span>system<span>.</span>
<span>Explanation: Oxygen is the more electro-negative of the atoms in the water molecule, so it tends to pull the 'shared' electron more to itself. Thus, the oxygen atom has a greater time-share of all electrons, and therefore the hydrogen atoms are more positive for a partial lack of electrons</span>
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