Answer:
In its modern form, the metric system is called the _____ system, which is an abbreviation for the "International System of Units." The official measuring system in the United States is the metric system.
Vitamins are essential compounds that must be acquired through the diet
because the body can't synthesize them. One of the reasons vitamins are
needed is because they play an indirect role in catalysis, in which
enzymes speed up chemical reactions. :D
