The organism responsible for oxygenating our atmosphere can still be found on Earth today.

The organism responsible for oxygenating our atmosphere can still be found on Earth today.

• A. True
• B. False
• C. Not sure
• D. Cannot be found

Answer: (A)

Oxygen in Earth’s atmosphere came from oxygen-producing photosynthesis carried out by cyanobacteria in the ancient oceans. These microbes still thrive today in oceans, lakes, soils, and biofilms, producing oxygen as a byproduct of photosynthesis. Because they are still around, the organism responsible for oxygenating our atmosphere can be found on Earth today. This is why the statement is true.

Oxygen in Earth’s atmosphere came from oxygen-producing photosynthesis carried out by cyanobacteria in the ancient oceans. These microbes still thrive today in oceans, lakes, soils, and biofilms, producing oxygen as a byproduct of photosynthesis. Because they are still around, the organism responsible for oxygenating our atmosphere can be found on Earth today. This is why the statement is true.