Question

How did the success of photosynthetic bacteria change Earths atmosphere?

Decreased oxygen concentration
Deceased hydrogen concentration
Increased oxygen concentration
Increased hydrogen concentration

Answer 1

Answer:

Increased oxygen concentration

Explanation:

The evolution of O2-producing cyanobacteria that use water as terminal reductant transformed Earth's atmosphere to one suitable for the evolution of aerobic metabolism and complex life. The innovation of water oxidation freed photosynthesis to invade new environments and visibly changed the face of the Earth.

Answer 2

Photosynthetic bacteria changed Earth's atmosphere by increasing oxygen concentration.

• Earth's primitive atmosphere didn't contain important levels of oxygen, it was rich in methane, ammonia, water vapor, etc.

• Cyanobacteria (blue-green algae) are bacteria capable of photosynthesizing, thereby releasing oxygen as a byproduct of this process.

• It has been proposed that the high oxygen levels in the atmosphere can be attributed to the evolution of photosynthetic cyanobacteria, which emerged approximately 3.5 billion years ago.

In conclusion, photosynthetic bacteria changed Earth's atmosphere by increasing oxygen concentration.

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