=COUNTIF(A2:A5,A2)+COUNTIF(A2:A5,A3) Counts the number of apples (the value in A2), and oranges (the value in A3) in cells A2 through A5. The result is 3. This formula uses COUNTIF twice to specify multiple criteria, one criteria per expression. You could also use the COUNTIFS function.
Punctuated equilibrium. Definition. noun. A theory that describes an evolutionary change happening rapidly and in brief geological events in between the long periods of stasis (or equilibrium). The theory is based on the stasis in fossil records, and when phenotypic evolution occurs, it is localized in rare, rapid events of branching speciation.
Time-saving video on the definition of chemical equilibrium. The definition of chemical equilibrium is the point at which the concentrations of reactants and products do not change with time. It appears as though the reaction has stopped but in fact the rates of the forward and reverse reactions are equal so reactants and products are being created at the same rate. chemical equilibrium definition.