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Oxides of iron only came on the scene well after there were trace fossils of organisms that we can reasonable assume did not use oxygen fueled metabolisms.

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Q: Why is it reasonable to assume that the earliest life on earth was anaerobic?
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If a 150lb guy goes to Triton how much would he weigh?

Triton's gravity is about 8% of Earth's. So it is reasonable to assume that he would weigh about 12lbs.

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why do pieces of earths earliest crust not exist today

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