This early atmosphere was rich in CO2 and H2O. How did oxygen enter our
atmosphere?
(a) Meteorites.
(b) From organisms that evolved to convert CO2 and H20 into sugars
(energy), resulting in the waste product oxygen.
(c) Volcanic emissions.
(d) Methanogenic bacteria.
atmosphere?
(a) Meteorites.
(b) From organisms that evolved to convert CO2 and H20 into sugars
(energy), resulting in the waste product oxygen.
(c) Volcanic emissions.
(d) Methanogenic bacteria.