Question

how was oxygen fatal for first life forms on our planet?​

Answer 1

Answer:

At some point, though, as cyanobacteria flourished, the minerals and other sinks became saturated. They could no longer absorb the oxygen being produced. It built up in the water, in the air. To the other bacteria living in the ocean—anaerobic bacteria, remember—oxygen was toxic.

Answer 2

Answer:

At some point, though, as cyanobacteria flourished, the minerals and other sinks became saturated. They could no longer absorb the oxygen being produced. It built up in the water, in the air. To the other bacteria living in the ocean—anaerobic bacteria, remember—oxygen was toxic.

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