Question

How did the success of photosynthetic bacteria change Earth’s atmosphere?(1 point)
Responses

decreased oxygen concentration
decreased oxygen concentration

decreased hydrogen concentration
decreased hydrogen concentration

increased hydrogen concentration
increased hydrogen concentration

increased oxygen concentration
GPT-4o mini
The correct response is:

**increased oxygen concentration**

Photosynthetic bacteria, such as cyanobacteria, produced oxygen as a byproduct of photosynthesis, significantly increasing the Earth's atmospheric oxygen concentration over time. This process is known as the Great Oxygenation Event.

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