Since lower case m stands for both the prefix. milli and for unit for length meter, how do we tell which one is meant when they are used?
a: a prefix is never used alone. so a lone m (lower case) would refer to a unit, the meter (the si metric unit of length.)
b: the prefix comes before the unit, so mm (both lower case) would stand for millimeter.
c: the prefix comes before the unit, so mg (both lower case) would stand for milligram.
d: all of the other 3 answer choices.
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