Question 1
The first fully land-based animals were ________.
◦ amphibians
◦ eukaryotes
◦ reptiles
◦ cephalopods
◦ stromatolites
Question 2
During the Cambrian, Trilobites developed a flexible exoskeleton which allowed them to ________.
◦ climb trees and find food
◦ avoid being eaten by other creatures
◦ burrow in soft sediment to find food
◦ eat smaller life forms by crushing them in their jaws
◦ sink to the bottom of shallow ponds to find food