The correct option is this: ELECTRONS ARE THE SUB ATOMIC PARTICLES WITH THE SMALLEST MASS.
The atom is made up of three sub particels, which are protons, neutrons and electrons. Both proton and neutrons have the atomic mass of 1 unit while the mass of the electron is 0.0005.
Most likely B. Highest temp and more volume
Use a periodic table, It should help
Answer is: D. kilograms and cubic millimeters
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Kilogram (symbol: kg) is the base unit of mass (anything that has mass in this question) in the International System of Units and cubic millimeter (symbol: mm³) is volume measurement unit (takes up space).
Second (symbol: s) is the base unit of time in the International System of Units and kilometer (symbol: km) is a unit of length in the metric system.
Gram (symbol: g) is a metric system unit of mass, but millimeter (abbreviated: mm) is an unit of distance in the metric system.
Yard (abbreviation: yd) is an unit of length and liter (symbol: l) is metric unit of capacity.