What is a disadvantage of a series circuit? A. Electricity can flow through the circuit.
B. If one light goes out, the rest go out.
C. It contains a battery.
D. It uses the least amount of wire.

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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