astronomers observe several distant superclusters moving away from earth. explain how they can use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate

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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i think   the answer is c hope i'm right

c. is the answer

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the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)