Want this question answered?
The first atmosphere of the earth was probably mostly hydrogen with some simple hydrides such as water vapor, methane and ammonia. Vulcanism and asteroidal bombardment eventually replaced this with an atmosphere of mostly nitrogen, with carbon dioxide and some of the inert gasses.
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 .
nitrogen
The first atmosphere of the earth was probably mostly hydrogen with some simple hydrides such as water vapor, methane and ammonia. Vulcanism and asteroidal bombardment eventually replaced this with an atmosphere of mostly nitrogen, with carbon dioxide and some of the inert gasses.
yes
oxygen
oxygen
nitrogen
no
photosynthsis
photosynthesis
Photosynthesis by plants
oxogen: unkown because of unknown life. elements: everything but pure potassium because that was not made till 1900's because it acts with air
Hydrogen and helium