1. which period represents the last 2 million years of geologic time?

a. tertiary
b. quaternary
c. devonian
d. cambrian

2. what cause many events of mountain building, volcanism, and earthquakes in western north america during the cenozoic?

a. plate interactions
b. extinctions
c. glaciers
d. meteor collisions

3. which title best describes the current geologic age?

a. age of fishes
b. age of reptiles
c. age of mammals
d. age of flowering plants