Early land animals had to return to the water to reproduce.
Geologic events that occurred during the Paleozoic Era include mountain building and volcanic activity.
The Precambrian time period is segmented into very few parts because:
Animal life in the Paleozoic Era included all of the following EXCEPT ____.
Little is known about much of Earth’s early history because ____.
Life-forms that existed during the Paleozoic Era included ____.
The geological time scale is divided up and organized according to what life forms existed on earth.
The Precambrian time period is the largest on the geological time scale.
The change in environments that may have occurred at the end of the Paleozoic Era may have been caused by ____.
Early land animals had gills as well as lungs.
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