In general, the Earth's climate became cooler throughout the course of the Cenozoic which greatly influenced the evolution of mammal's during this time period. Which of these is not a correct statement about this cooling event?
a. the Antarctic and Arctic ice sheet both formed during the end of the Miocene
b. falling carbon dioxide levels lead to a reverse greenhosue effect
c. water locked in ice contributes to decreased sea levels
d. ocean circulation patterns are affected by global cooing
e. the closing of the isthmus of Panama is a result of the drop in global temperature

According to current studies, during glacial periods the change of ocean circulation and the increase of its productivity contributed to the reduction of atmospheric CO2 levels. As a result, this reduction influenced the cooling of the poles and the expansion of the Antarctic ice sheets in the Cenozoic period. Therefore the change in ocean circulation influences the cooling of the earth.