The formation of the moon may have caused the Paleozoic extinction.
What time period lasted for more than half of the hypothesized history of the Earth?
Early land animals had to return to the water to reproduce.
The change in environments that may have occurred at the end of the Paleozoic Era may have been caused by ____.
The development of ____ factored in the development of complex organisms.
Geologic events that occurred during the Paleozoic Era include mountain building and volcanic activity.
Early land animals had gills as well as lungs.
The Precambrian time period is the largest on the geological time scale.
The geological time scale is divided up and organized according to what life forms existed on earth.
Little is known about much of Earth’s early history because ____.
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