Posted by Jman on Monday, December 3, 2012 at 3:11pm.
1. The division of Earth’s history into smaller units makes up the ____.
geologic time scale***
sequence of events
2. Today, some scientists think that ____.
birds evolved from dinosaurs
dinosaurs evolved from fish
birds evolved from amphibians
both a and b***
3. A life-form in the Precambrian time was ____.
4. Which trilobite characteristic did not change through time?
shape of eyes
number of body segments
number of spines
5. ____ existed during the Mesozoic era.
both a and c***
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