What can be said about the relationship between enzymes and proteins? a few enzymes are proteins. no enzymes are proteins. a few enzymes contain proteins. all enzymes are proteins. all enzymes contain proteins. most enzymes are proteins?

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