There are currently 117 different elements known to humankind. Those elements make up everything we know.
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That depends on the substance. Different substances have different densities (mass / volume).
No, a root is a structure made of many different substances.
To determine how many units are in 12 mg, you need to know the specific substance's concentration or the conversion factor for that particular drug or material. Different substances may have different unit measurements based on their potency and formulation. Once you have that information, you can calculate the number of units in 12 mg accordingly.
Different schemes have different id numbers of different lengths.
mixed number