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- 1. Multiple Choice
What was the first period of the Precambrian Era?
Archean Period
Proterozoic Period
Cambrian Period
Ordovician Period
- 2. Multiple Choice
What were the first major events in the Archean Period?
The first oceans formed, then DNA appeared.
DNA appeared, then Pangea formed.
Tectonic plates started to shift, then banded iron started to form.
Pangea formed, then the oceans formed.
- 3. Multiple Choice
After the oceans formed and DNA appeared, what happened next?
Tectonic plates started to shift and form Pangea.
Pangea formed, then banded iron formed.
The first prokaryotes appeared, then tectonic plates started to shift.
Banded iron started to form, then prokaryotes appeared.
- 4. Multiple Choice
What happened after Pangea formed?
The first prokaryotes appeared, then banded iron started to form.
Banded iron started to form, then the first prokaryotes appeared.
Oxygen appeared in the atmosphere, the prokaryotic bacteria appeared.
Aliens started to inhabit the earth.
- 5. Multiple Choice
Cyanobacteria created oxygen.
True
False
- 6. Multiple Choice
The Archean Period ended after oxygen was created.
True
False
- 7. Multiple Choice
What was the second and last period of the Precambrian Era.
Proterozoic Period
Cambrian Period
Ordovician Period
Silurian Period
- 8. Multiple Choice
Anaerobic bacteria was already extinct by the time the Proterozoic Period began.
True
False
- 9. Multiple Choice
What major events happened at the very beginning of the Proterozoic Period?
The first mass extinction happened, then eukaryotic bacteria appeared.
Eukaryotes appear, closely followed by multicellular life forms.
Earth freezes over, then the first mass extinction happened.
Multicellular life forms appear, then Earth freezes over.
- 10. Multiple Choice
After the first mass extinction happened and the first eukaryotes appear, what happens?
The Earth freezes over, then the first multicellular life forms appear.
The first multicellular life forms appear, then Earth freezes over.
The ozone layer stabilizes, then Earth freezes over.
The Earth explodes.
- 11. Multiple Choice
The Precambrian Era ends when the ozone layer stabilizes.
True
False
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