Shay111724
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How do the atmosphere conditions near the beginning of Precambrian time contrast with the atmosphere conditions that are present now?

Respuesta :

francisstallings02
The early precambrian atmosphere consisted primarily of nitrogen and carbon dioxide with almost no oxygen. 

Today, the atmosphere contains about 20% oxygen, less carbon dioxide and similar amounts of nitrogen. 

Photosynthetic green-leaf plants and trees are largely responsible for the change, converting carbon dioxide to oxygen.

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