Which cell structure is the gatekeeper, controlling what goes in and out of the cell? a) c - nucleus b) e - vacuole c) a - cell membrane d) b - endoplasmic reticulum

Modern weaponry has increased the number of deaths in wars and violent conflicts.

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

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