Geography, 29.10.2019 15:31 mikeylaaliz5901

Early in the earth's history there was little to no oxygen into atmosphere. how did oxygen levels in the atmosphere reach current levels?

a) volcanoes released oxygen from within the earth.

b) the earth captured oxygen from space with its gravity.

c) water molecules on the earth were broken to release oxygen.
eliminate

d) early bacteria and plants released oxygen through photosynthesis.

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