The Three Eras Quiz
How long was percambrian era?
6.4 billion year ago
71 years ago
4.6 billion years ago
1 year ago
In which part of the Paleozoic Era did fish start to appear?
Devonian
Jurassic
Silurian
Why was there carbon dioxide in the air?
There to much human activity.
There was carbon dioxide in the air because of the volcanos that erupted.
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