Science please help

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List and briefly outline the six different periods into which the Paleozoic era is divided.



The six periods:
1:Cambrian, which was 545 million years ago.
2:Ordovician, which was 490 million years ago.
3:Silurian, which was 445 million years ago.
4:Devonian, which was 415 million years ago.
5:Carboniferous, which was 355 million years ago.
6:Permian, which was 290 million years ago.


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