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Oxygen. Earth's early(first) atmosphere is believed to contain hydrogen cyanide, carbon dioxide, carbon monoxide, nitrogen, hydrogen sulfide, and water. but still it only had little to no oxygen.
Yes
mostly carbon dioxide with little or no oxygen.
Oxygen Please study this, & don't forget it so you don't have to keep looking up answers .
photosynthesis
yes
oxygen
oxygen
no
photosynthsis
Photosynthesis by plants
Oxygen. Earth's early(first) atmosphere is believed to contain hydrogen cyanide, carbon dioxide, carbon monoxide, nitrogen, hydrogen sulfide, and water. but still it only had little to no oxygen.
oxygen
Yes
Earth's early atmosphere was primarily composed of carbon dioxide. Early bacteria used carbon dioxide as a source of fuel and as a result produced oxygen.
mostly carbon dioxide with little or no oxygen.
EARLY ATMOSPHERE have humidity