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Most scientists accept the hypothesis that the earliest life-forms in Earth evolved in an environment quite different from our own. Sort these characteristics bass on whether they describe early Earth or modern Earth.

-significant amounts of oxygen in the atmosphere
-most of the planet covered in liquid water
-carbon dioxide levels balance by processes of living organisms
-significant amounts of volatile gases in the atmosphere
-most of the planets water in gaseous form
-large amounts of carbon dioxide in the atmosphere

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