The advance and retreat of ice sheets
a. happened most recently about 18,000 years ago at the lower latitudes
b. happened most recently about 350 million years ago at the lower latitudes
c. happened most recently about 18,000 years ago over much of the northern hemispheres
d. happened most recently about 18,000 years ago over much of the northern hemispheres and caused alternating periods of heating and cooling
e. ice sheets were very stable throughout geologic time and did not advance or retreat
D
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