Over the past 200 years, global migrations are increasing the variety of features seen in local populations, but is also blurring regional patterns in traits

Idk what country are we talking about?

What are the following resources?

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