Question 1
The beginning of the Phanerozoic is marked by the ________.
◦ abundant life forms compared to earlier times
◦ evolution of land plants and animals
◦ development of hard body parts, such as shells and bones
◦ formation of large land masses
◦ existence of a modern atmosphere
Question 2
At the start of the Paleozoic, North America ________.
◦ did not exist
◦ had no plants or animals
◦ was a large number of small fragments that had not yet collided
◦ was mountainous and dry
◦ had abundant life