Question

Which statement describes a process involved in the evolution of Earth’s early atmosphere?

- Cyanobacteria transformed carbon dioxide in the atmosphere into oxygen during photosynthesis.
- Heavier gases escaped through Earth’s atmosphere, leaving only lighter gases such as oxygen behind.
- Volcanic eruptions produced enough oxygen to create Earth’s atmosphere.
- The amount of oxygen in the atmosphere declined due to respiration, or breathing.

Answer 1

"Cyanobacteria transformed carbon dioxide in the atmosphere into oxygen during photosynthesis" is the correct answer. I just took that mastery test and got 5/5. Hope this helps!

Answer 2

The early atmosphere was reducing but became oxidizing when Cyanobacteria transformed carbon dioxide in the atmosphere into oxygen during photosynthesis.

What was the nature of the early atmosphere of the earth?

The early atmosphere of the earth was a reducing in nature unlike the present atmosphere.

Changes that occurred in the organisms on earth helped to convert the early atmosphere to an oxidizing one.

Cyanobacteria transformed carbon dioxide in the atmosphere into oxygen during photosynthesis thereby releasing oxygen into the atmosphere and making it oxidizing in nature.

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