ari7lway9savGom ari7lway9savGom

16-02-2016
Biology

contestada

Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today.
a. hydrogen
b. oxygen
c. lead
d. ore

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Аноним Аноним

16-02-2016

oxygen is you answer

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GangstaGurl GangstaGurl

16-02-2016

I would probably go with B. Oxygen, I hope that this helps!

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