Question 1
Mammals became the dominant land animals during the ________ era.
◦ Cenozoic
◦ Mesozoic
◦ Paleozoic
◦ Cretaceous
◦ Pleistocene
Question 2
Human ancestors developed the tendency to walk on two legs instead of four in order to accommodate ________.
◦ picking fruit
◦ running across hot ash beds in Tanzania
◦ climbing trees in the forests
◦ hunting and gathering food in grasslands
◦ riding elephants