There were dozens of presentations in 2008, including: […
Source: wiktionary
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3 total sentences available.
There were dozens of presentations in 2008, including: […
Source: wiktionary
Oxygen levels on Earth skyrocketed 2.4 billion years ago, when cyanobacteria evolved photosynthesis: the ability to convert water and carbon dioxide into carbohydrates and waste oxygen using solar energy.
Source: wiktionary
Each year, human activities release more carbon dioxide into the atmosphere than natural processes can remove, causing the amount of carbon dioxide in the atmosphere to increase.
Source: wiktionary