Volcanic eruptions
photosynthesis
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 .
on ancient Earth, nitrogen, water vapor, carbon dioxide, and methane were probably the most abundant gases in the atmosphere.
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.
yes
oxygen
oxygen
nitrogen
no
photosynthsis
photosynthesis
nitrogen
Photosynthesis by plants
Hydrogen and helium
Carbon dioxide