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Oxygen has came from trees many years ago.
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∙ 14y ago
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Did the primitive Earth have oxygen?
No. Oxygen is not believed to have been present in the early years of Earth's history.
When did oxygen revolution begin?
The Oxygen Revolution, Cyanobacteria has been tremendously important in shaping the course of evolution and ecological change throughout earth's history.
Two of the worst aviation accidents in US history resulted from your reaction with oxygen?
Hydrogen
Can oxygen catastrophic events in the Earth's history that can be tracked through sudden changes?
Yes?
What was the original name for oxygen?
"fire air" by the Swedish pharmacist Cal Wilhem Scheele the discoverer of oxygen. See: http://en.wikipedia.org/wiki/Oxygen#History
What is the history of using the suns energy?
for history please visit http://www.dbksolar.com/ It gives the history, i found it interesting myself.
What event in earths history was dependent on the development of a certain type of life form?
addition of free oxygen
Are oxygen tanks in homes dangerous?
No, not unless you have an extensive history of pulmonary emphysema. Though essential for life, as with most things it can be if used incorrectly. For instance fire needs oxygen to burn, introducing more oxygen would increase the rate of burning.
What is the difference between green water and blue water?
Green water has more oxygen, than blue water. In the early years of our planet's history, our water was green, because the earth had a higher oxygen content.
How did oxygen begin to accumulate in the atmosphere?
Algae and later plants used sunlight to convert water and carbon dioxide into carbohydrates and oxygen. Until about the middle of the Paleozoic oxygen went into the atmosphere faster than it could be removed.
Is it normal to have oxygen saturation at 93 percent?
An oxygen saturation of 93% is acceptable but needs to be checked from time-to-time because if it falls below 90, oxygen supplementation may be needed. Also, it demends on the person's medical history. For example, if the patient has a history of a disease such as COPD criteria for acceptability may be different. Medical consultation may be needed. Never make medical decisions base primarily on infomration found in sources such as this web site. Always consult a qualified medical professional, who can consider all aspects of the person's condition and medical history.
What do scientists think was the of the oxygen in earths atmosphere?
It came from primitive organisms early in earth's history. They were the first organisms to use photosynthesis to make food, by using light to convert Carbon dioxide and water into glucose (food) and oxygen. Since oxygen is a waste product of photosynthesis, it was released into the air. As more and more of these organisms multiplied, large amounts of oxygen were released into the air, forming today's atmosphere.
