What level of secondary schooling is required to become a chemist?

It depends on what kind a chemist you mean . A pharmacist or working in an industrial chemical laboratory. Pharmacy requires a degree but to work in a lab y a laboratory assistant only requires  a GCSE in the UK

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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