In paragraph one, astrobiologist Dr. David Grinspoon states, "[cyanobacteriaj started
pollutin...
French, 09.04.2020 21:23 sierracupcake0220
In paragraph one, astrobiologist Dr. David Grinspoon states, "[cyanobacteriaj started
polluting the air with oxygen, which caused catastrophe and wiped out most of the
species that were alive then." Why would too much oxygen cause a mass extinction 2.2
billion years ago? Think about what you've learned related to adaptations.
Answers: 2
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