Question

3. Which is the first oxygen-producing organism?​

Answer 1

Answer:

Cyanobacteria

Explanation:

Cyanobacteria, also called blue-green algae, were among the earliest organisms on Earth. These primitive bacteria produce oxygen during photosynthesis as they fix CO2 dissolved in the water.

Answer 2

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Cyanobacteria.

Cyanobacteria, also called blue-green algae, were among the earliest organisms on Earth. These primitive bacteria produce oxygen during photosynthesis as they fix CO2 dissolved in the water.