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In the past, there was more oxygen in the atmosphere due to higher levels of photosynthesis by plants and algae, which produced oxygen as a byproduct.

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AnswerBot

4mo ago

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Why is there more oxygen today than in the past?

People have recycled and planted many trees and plants that will gives fresh air and more of it is here today.


Was oxygen higher in the past?

Yes, oxygen levels were higher in the past, particularly during the Carboniferous period around 300 million years ago. During this time, oxygen levels were around 35% compared to the current levels of around 21%.


What is past tense of more?

"More" is not a verb. It has no past tense.


What do oxygen do?

oxygen can help you breathe and more.............


What is the past tense of more?

There can be no past tense for more, as it is an adjective, not a verb.


What gives more oxygen to the atmosphere?

Plankton gives more oxygen to the atmosphere.


Which is more electronegative O or Se?

Oxygen (O) is more electronegative than Selenium (Se) because oxygen is higher up and to the right in the periodic table, which increases its ability to attract and hold onto electrons in a chemical bond.


Which has more dissolved oxygen a stream or a lake?

there is more dissolved oxygen present in a stream because the movement and the bubbling of the air allows more oxygen to be ingested


Why does magnesium burn more in oxygen that in air?

First off, it doesn't burn more, it burns quicker. This is because It's reacting with the oxygen, and in a 100% oxygen environment there's simply more oxygen to react with (the air is 21% oxygen).


Is there more oxygen in shallow water then deep water?

No. There is more oxygen in deeper water.


Does the Blood that is pumped from the heart to the lungs through the pulmonary artery have more carbon dioxide or more oxygen?

More oxygen, for the pumped blood circle through the body and the body consumes more oxygen and carries more oxygen than it carries carbon-dioxide.


Why you breath more during excersise?

because your body is using more oxygen so it needs to get more oxygen