Acompound contains two or more asimple substances
b protons combined with electrons
c elements physically combined
d elements chemically combined

the answer is tropical areas. the tropical areas obtain more

radiant energy from the sun than they lose to space through terrestrial

radiation, and vice versa for polar areas. earth has an energy remaining in the

tropics and an energy scarcity for the polar areas.

explanation:

human didn't come from monkeys man i hate these stupid teachers