The basic principle in balancing a chemical equation is a- have the same number of molecules of each substance in the reactants and in the products b-have the same number of atoms of each element in the reactants and in the products c-have the sum of coefficients in reactants equal to that in the products d-have the same number of reactants as products

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).