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Feb 10, 2020, 5:05 am224 pts
Earth911
As any sci-fi fan can tell you, human survival depends upon an Earth-like atmosphere that’s 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, and 0.03 percent carbon dioxide with traces of other elements. There is some wiggle room in the tiny percentage of carbon in the air. There were 200 parts per…
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