What geographic areas make up a city state?

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen

How is this even a question?

According to new research, more than 5..5 million deaths are associated with polluted air. hope this : ).

Iwould say the answer is d