A life-form in the Precambrian time was ____.
The Precambrian time period is segmented into very few parts because:
The Precambrian time period is the largest on the geological time scale.
Cyanobacteria increased the levels of carbon dioxide in the atmosphere.
The geological time scale is divided up and organized according to what life forms existed on earth.
Life-forms that existed during the Paleozoic Era included ____.
What time period lasted for more than half of the hypothesized history of the Earth?
Animal life in the Paleozoic Era included all of the following EXCEPT ____.
Geologic events that occurred during the Paleozoic Era include mountain building and volcanic activity.
The development of ____ factored in the development of complex organisms.
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