Where does almost all of the energy on Earth come from? *

Nearly all of the earth's energy comes from the sun. Some of this radiant energy is reflected by water droplets and dust particles in the atmosphere and bounced back into space or scattered throughout the atmosphere; some is absorbed by clouds or ozone.

Explanation:

your answer is "the 1950's"

the correct answer is:

a population changes in response to a change in the environment.