Layers of mud made mostly of tiny shells and calcite crystals form the soft rock chalk.
can you explain it?

What must happen before a body cell can begin mitotic cell division

Ethanol (c2h5oh) is produced from the fermentation of sucrose in the presence of enzymes. c12h22o11(aq) + h2o(g) 4 c2h5oh(l) + 4 co2(g) determine the theoretical yield and the percent yields of ethanol if 680. g sucrose undergoes fermentation and 326.5 g ethanol is obtained. theoretical _ g _ percent %

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.