According to the theory of evolution, the atmosphere of the very early Earth contained no oxygen, but it did contain carbon dioxide. When the plants and trees evolved, they lived on the carbon-dioxide as they still do today and, by metabolizing carbon dioxide, they released oxygen as a waste product.
Read more here: Creation Moments
![Away in a Manger [Live]](http://img.youtube.com/vi/Xob9GQ6vw04/0.jpg "Away in a Manger [Live]")
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