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Megagram or megagramme is equal to 1 000 000 gram (unit of mass), comes from a combination of the metric prefix mega (M) with the gram (g). Plural name is megagrams.
microgram or microgramme is equal to 10-6 gram (unit of mass), comes from a combination of the metric prefix micro (µ) with the gram (g). Plural name is micrograms.