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Well, nobody knows for sure, but the most likely theory is that photosynthesis by cyanobacteria (blue-green algae) was what started the rise in atmospheric oxygen levels; some could also have been released by ultraviolet radiation from the sun separating water molecules in the early oceans into hydrogen & oxygen.

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Was the earths early atmosphere made up of mostly oxygen?

no


What gases were there in the early atmosphere?

Oxygen


What are the Gases of the early atmosphere?

Nitrogen and Oxygen.


What gas was lacking from earths early atmosphere in the early precambrian?

oxygen


What percent of our atmosphere is made up of oxygen?

Approximately 21% of Earth's atmosphere is made up of oxygen.


Was there oxygen in the early earths atmosphere?

It is believed that the early Earth's atmosphere did not contain significant amounts of oxygen. Oxygen began to accumulate in the atmosphere around 2.4 billion years ago due to the emergence of photosynthetic organisms.


What element upon which most modern organisms depend was missing from earth's early atmosphere?

Oxygen was the element missing from Earth's early atmosphere, which eventually accumulated due to early photosynthetic organisms. This change in the atmosphere allowed for the evolution of organisms that rely on oxygen for respiration.


What are the 2 gases of the early atmosphere?

Nitrogen and Oxygen.


What gas was not part of early earths atmosphere?

oxygen


How was the early atmosphere different from your atmosphere?

The early Earth's atmosphere was likely composed of gases like carbon dioxide, water vapor, nitrogen, and minimal oxygen. It was lacking in oxygen compared to the current atmosphere, which is about 21% oxygen. Additionally, early Earth's atmosphere lacked the protective ozone layer present in our atmosphere today.


How did the primitive atmosphere differ from atmosphere today?

As opposed to today's atmosphere, the Earth's early atmosphere would have been quite impossible for human life to thrive in. Today the atmosphere consists primarily of Nitrogen, Oxygen, and Carbon Dioxide, but early Earth's first atmosphere was probably made of Hydrogen and Helium.


How the did primitive atmosphere differ from your atmosphere today?

As opposed to today's atmosphere, the Earth's early atmosphere would have been quite impossible for human life to thrive in. Today the atmosphere consists primarily of Nitrogen, Oxygen, and Carbon Dioxide, but early Earth's first atmosphere was probably made of Hydrogen and Helium.