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Fish use density in order to move in the water since they do not have lungs. When the density of water keeps changing, fish use it to move and thereby using less energy.

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Jamil Gibbons Phone Number?

Density is due to the amount of atoms in given space (grams per cubic centimeter). When we cool water, the water molecules move closer together (and more slowly) leading to an increase in density in cold water. When we heat water, they gain energy and move farther apart (and move faster), lowering the density of the water.