Geography, 10.10.2019 00:10 savannahckatz

6. during the permian mass extinction: a) oxygen levels in the deep oceans dropped b) global warming occurred as a result of volcanic eruptions c) a meteorite hit the earth d) both a & b are correct. e) a, b & c are all correct.

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6. during the permian mass extinction: a) oxygen levels in the deep oceans dropped b) global warmin...