1 ¿Qué estrella es tan caliente como nuestro sol, pero unas 4.000 veces más brillante?

Ithink it’s true as the answer.

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

Developed countries will see a decrease in natural resources, because their population will decrease.