Select geological, biological, and climate changes that occurred during the Paleogene period of the Cenozoic era and that affected speciation and extinctions of organisms during this time period.
a. A series of ice ages covered plant communities with ice.
b. Tectonic plates shifted and created mountains.
c. Grasslands largely disappeared.
d. Wet, warm forests were widespread.
e. The oldest known bat fossil dates to the Paleogene period