The correct order of the geologic eras, from most ancient to most recent, is __________.
a. Paleozoic, Cenozoic, and Mesozoic
b. Cenozoic, Mesozoic, and Paleozoic
c. Mesozoic, Cenozoic, and Paleozoic
d. Paleozoic, Mesozoic, and Cenozoic
Which of the following is the correct ordering of divisions of the geologic record from largest to smallest?
a. eon, era, period, epoch
b. epoch, era, period, eon
c. period, epoch, era, eon
d. eon, period, epoch, era