An example of a producer is
a: corn in a field
b: farmer who raises corn
c: earthworm in cornfield
d: chicken raised on a farm

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