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Most but perhaps not all began when tiny organisms known as cyanobacteria, or blue-green algae (in the seas and oceans) began conducting photosynthesis: using sunlight, water and carbon dioxide to produce carbohydrates and oxygen.
In fact, all the plants on Earth incorporate symbiotic cyanobacteria (known as chloroplasts) to do their photosynthesis for them today.
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∙ 9y ago
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∙ 9y agoMost of the oxygen in the atmosphere comes from the process of photosynthesis.
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∙ 15y agoStars. They produce heavier elements upon their death.
Wiki User
∙ 9y agoMost of the oxygen in the air comes from plants. This is because the plants use photosynthesis which releases oxygen.
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∙ 12y agoThe vast portion of oxygen is generated by plants in the oceans - somevery tiny, other huge, like kelp, for instance.
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∙ 13y agothe process of photosynthesis
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Atmosphere in the permian?
the atmosphere in the Permian had 115 % of modern oxygen level and 3x the amount of carbon dioxide- pre-industrial level.
What would have happened to the animals if there was no oxygen from the beginning?
There was no oxygen in the beginning. Plant life developed and released oxygen gas into the atmosphere over a long period of time.If that had never happened, there would not be much if any free oxygen in the atmosphere and aminal life as we know it would never have developed.
How do plants MOST likely change the atmosphere in a way that is beneficial for animals?
When animals exhale, they release a gas called Carbon Dioxide (CO2) which can be lethal to animals if the gas is present in large quantities. Through the process of photosynthesis plants absorb carbon dioxide from the atmosphere and release oxygen as a byproduct. This helps animals because they need oxygen in order to breathe.
What would happen to animals if the amount of oxygen the earths atmosphere decreased?
youll die
The environment stores many materials the atmosphere stores a lot of what?
21% oxygen, 78% nitrogen 1% other.the atmosphere stores a lot of gaseous compounds if you want to sum it up
Where do the oxygen atoms in the CO2 come from?
The oxygen most often comes from the atmosphere which is 21% oxygen.
Does air come from the sun?
No. Earth's atmosphere most likely originate from volcanic atmosphere. The oxygen is produced by plants.
Do trees provide the most oxygen for the atmosphere?
Yes, trees do provide most of our oxygen for the atmosphere
What gives us most of our oxygen in the atmosphere?
Plants gives us most of our oxygen in the atmosphere.
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.
Where does the free oxygen in Earths atmosphere come from?
The free oxygen bubbled up from the oceans.
What has the most oxygen in it?
The oxygen molecule, the form of oxygen found in the Earth's atmosphere, is 100% oxygen. There fore it is the material that has the most oxygen in it.
What is the second most abundant gas in the Earth's atmosphere?
Oxygen
What are the two most common gases in atmosphere?
Nitrogen & Oxygen.
Is most of the earths atmosphere covered with oxygen?
no
Where does oxygen in water come from?
Water molecules are formed by the reaction between hydrogen and oxygen.
What is oxygen most commonly found in?
Oxygen is most commonly found in the air of Earths atmosphere.
