FusionSh4dow FusionSh4dow

10-02-2017
Social Studies

contestada

Oxygen was initially created in earth's atmosphere by ____.
●Volcanoes outgassing
●cyanobacteria photosynthesizing
●greenhouse effect
●Ozone breaking down

Respuesta :

kkwynn1999 kkwynn1999

10-02-2017

it would be cyanobacteria photosynthesizing because photosynthesis in plants is what makes and releases oxygen

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kahknight kahknight

10-02-2017

Cyanobacteria is the source of oxygen.

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