A procedure that is often used to separate molecules by using their molecular charges is called .

Electrophoresis

Explanation:

the procedure is usually used in life science laboratories to separate nucleic acids (DNA and RNA), which are negatively charged. An electric current at a certain voltage is passed through the electrophoresis tank containing the buffer. molecules to be separated are filled in the wells of a solidified gel ( usually agarose gel).As the current passes, the charged molecules move to opposite electrodes. The movement of molecules in in the gel also depends on the size of the molecules.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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