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Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today. A. lead B. hydrogen C. ore D. oxygen
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Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today.

A. lead
B. hydrogen
C. ore
D. oxygen

User Omkar Nath Singh
by
8.5k points

1 Answer

6 votes
I think it is D. oxygen.
User Ben Brammer
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8.5k points
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