Coefficients in a chemical express beetween molecules or compounds

Molecules

Explanation:

First: the coefficients give the number of molecules (or atoms) involved in the reaction. In the example reaction, two molecules of hydrogen react with one molecule of oxygen and produce two molecules of water. Second: the coefficients give the number of moles of each substance involved in the reaction

wegner's theory did not explain how the continents could move

explanation:

which fault and or fold did you find most difficult to diagram