The less mass in a given volume of air, the
a. more the air weighs.
b. greater the air pressure.
c. more dense the air.
d. less dense the air.

Cultural convergence is the theory that two cultures will be more and more like each other a very notable example of this is around the u.s.-mexico border, where 

Ihave no idea. about. that

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

D.the role of religion has steadily declined in recent years.pl give me  branliest