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Oxygen is necessary for most organisms to carry out their life functions.

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9y ago

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What gas was not part of early earths atmosphere?

oxygen


Where is oxygen obtained for mammals?

Obtained by Earths atmosphere which is 20% Oxygen and processed by the aveoli (part of the lung).


Is the sea part of the earths atmosphere?

No. It is part of the hydrosphere.


What important gas is part of earth s atmosphere?

I'd say the most important gasses in the Earth's atmosphere are oxygen and water vapour.


What gas became part of Earths atmosphere mainly as a result of the evolution of life-forms?

Oxygen became part of Earth's atmosphere mainly as a result of the evolution of life forms, particularly through photosynthesis by early cyanobacteria and plants. This process involved converting carbon dioxide into oxygen as a byproduct, leading to the oxygen-rich atmosphere we have today.


Why is the atmosphere classed as an oxygen atmosphere?

Earth's atmosphere is mainly nitrogen, oxygen, carbon dioxide, and water vapor. Oxygen is the most reactive of these. Oxygen allows all of the life as we know it on earth. Even though oxygen is less than 1/4 of the atmosphere it is the most important part.


What gas was not a part of earths early atmosphere?

nitrogen


What is a gas upper part of of earths atmosphere?

ozone


Where is most of the water vapor and carbon dioxide in earths atmosphere found?

Upper Part


What part of earths spheres is composed of a mixture of gases?

the entire atmosphere...


Is hydrogen part of earths atmosphere?

Yes. Hydrogen is part - albeit a very small part - of the Earth's atmosphere. Typically it makes up about 0.000055% of the atmosphere


Which gas is not part of earths original athmosphere?

Oxygen.