The rise and fall of oxygen
Atmospheric oxygen level and the evolution of insect body size | Proceedings of the Royal Society B: Biological Sciences
A persistently low level of atmospheric oxygen in Earth's middle age | Nature Communications
Science With A Little Altitude - 23andMe Blog
Global atmospheric oxygen variations recorded by Th/U systematics of igneous rocks | PNAS
Curiosity Rover Serves Scientists a New Mystery: Oxygen | NASA
BBC NEWS | Science/Nature | Charcoal reveals wildfire history
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File:Sauerstoffgehalt-1000mj2.png - Wikimedia Commons
Why did the Earth have a higher percentage of oxygen in the atmosphere during the distant past, and what caused that percentage to drop? - Quora
If you could travel back in time on our planet, how far back could you go before Earth ceased to be conducive to human life? - Quora
PLOS ONE: Global Brain Blood-Oxygen Level Responses to Autonomic Challenges in Obstructive Sleep Apnea
Historical Global Atmospheric Oxygen Levels Graph & Widget
The rise and fall of oxygen
Has the Earth's oxygen levels changed in the last 100 years? - Quora
Oxygen and animal evolution: Did a rise of atmospheric oxygen “trigger” the origin of animals? - Mills - 2014 - BioEssays - Wiley Online Library
Geological history of oxygen - Wikipedia
The human physiological impact of global deoxygenation | The Journal of Physiological Sciences | Full Text
atmosphere - Causes of fluctuations in atmospheric oxygen in past 300 Mya - Earth Science Stack Exchange
Dissolved Oxygen - Environmental Measurement Systems
Multimedia Gallery - A graph of atmospheric oxygen levels over time. | NSF - National Science Foundation
Historical Global Atmospheric Oxygen Levels Graph & Widget
