A.chlorine
B. silver
C. helium
D. hydrogen
The answer is A and D
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The meter in the SI, the foot in the Imperial system.
meter means the basic unit of length in the international system of units.
length: meter volume: cubic meter mass: kilogram
Length . . . meter Mass . . . kilogram Time . . . second Volume . . . cubic meter
Meters; for larger distances or sizes, kilometers. In astronomy, the following non-SI units are often used: astronomical units; light-years; parsecs.