<span>While some areas of the U.S. have a high population density, others must have extremely low population densities.</span>
<span>This phylum exists exclusively in the sea, and cannot be found on land or in fresh water.
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Na+ ion in sodium chloride is attracted to the oxygen side of the water molecules, while the Cl- ion is attracted to the hydrogens' side of the water molecule
this causes the sodium chloride to split in water, and the sodium chloride dissolves into separate Na+ and Cl- atoms
