After the number of wolves increased from 1970–1975, what happened to the moose population in the following years?
a. the population decreased.
b. the population stayed the same.
c. the population reached carrying capacity.
d. the population increased.

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere