Asubstance is composed of only one kind of atom and can't be separated into simpler substances or converted into another substance by chemical processes.
under which category would you classify this substance?
a) element
b) compound
c) solution
d) suspension

The correct answer among the choices given is option A. Elements are distinguished from compounds. An element is a pure chemical substance which is from a same atom while compounds are from different elements. It contains atoms of different elements.

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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a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.