Which of the following is the study of where people live in the ways in which people live in those areas a). human demography b). human psychology c). human geography d). human biology

I'm pretty sure it's Human Geography

Avertical or horizontal line used in graphs is called a(n) equatorhope this

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