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.
Fill in the blank?The Mesozoic Era has three parts to it,there's the Trassic,Jurassic and_______.
Silurian
Devonian
Cretaceous
Cambrian
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