Science Jacinto, Zachary

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TheEarths original atmosphere was mainly hydrogen and helium.
3.5 billion years ago.. nitrogen, carbon dioxide and methane can also be found. While traces of oxygen can be seen in water only.
In the ocean a microbial species that's floating evolved a new ability calledPHOTOSYNTHESIS
Then.. The GREAT OXYGENATION CATASTROPHE occurred when cyanobacteria living in the oceans started producing oxygen through photosynthesis.
As oxygen built up in the atmosphere anaerobic bacteria were killed leading to the Earth's first mass extinction
2 billion years ago ICE AGE occuredWherein Methane and Oxygen reacted to form carbon dioxide and water then forming Ice all over earth.
With the help of aerobic organisms they absorbed the excess gas in the atmosphere. Eventually the oxygen concentration in the atmosphere normalized to 21% until now.
Animals take in oxygen and give off carbon dioxide.Plants take in carbon dioxide and give off oxygen.Plants and animals thrive in balance.
Because of the chemical energy of oxygen it gave the organisms the boost to diversify and evolve to a more complex form.

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