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zeptogram or zeptogramme is equal to 10-21 gram (unit of mass), comes from a combination of the metric prefix zepto (z) with the gram (g). Plural name is zeptograms.
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.