Why does a cell make a copy of its dna before it dvides?

The tendency of water molecules to stick together is referred to as a) adhesion b) polarity c) cohesion d) transpiration e) evaporation

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules