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citro-naut t1_j227r75 wrote on December 29, 2022 at 2:57 AM

Reply to comment by Austiniuliano in Earth was brought to life by ancient water-rich asteroids from the outer Solar System by marketrent

Most of the oxygen on earth is locked away in the rocks and minerals that make up the earth itself! The free oxygen in the earths atmosphere is almost entirely created by life. The first life forms on earth were not aerobic and didn’t use oxygen to metabolize.