As you travel from the north pole toward the equator, you would expect to see:
a. tundra; grasslands; tropical rain forest
b. tropical rain forest; deserts; taiga
c. temperate forests; taiga; tropical forests
d. taiga; deserts; tundra

As you travel from the North Pole toward the equator, you would expect to see tundra; grasslands; tropical rain forest. The correct option among all the options that are given in the question is the first option or option "a". I hope that this is the answer you were looking for and it has come to your help.

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