Two populations are said to be isolated if there is no longer any Gene Flow between them.
During chemical reactions, the bonds that hold molecules together break apart and form new bonds, rearranging atoms into different substances. Each bond requires a distinct amount of energy to either break or form; without this energy, the reaction cannot take place, and the reactants remain as they were. Simplisticly said During chemical reactions, the chemical bonds between atoms are altered.
Answer:
the moon's gravity increases over the oceans and decreases over the land