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

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Study for the Introduction to Physical Geology Exam with quizzes and multiple choice questions. Each question comes with hints and explanations to help you prepare effectively. Get ready for your exam!

Multiple Choice

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

Explanation:
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.

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