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

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Prepare for the Introduction to Physical Geology Exam with study guides and multiple choice questions. Each question comes with hints and detailed explanations to help you grasp key concepts in geology. Ace your exam with confidence!

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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