A chemical reaction that releases energy usually in the form of heat
The least prevalent gas in the atmosphere was oxygen several billion years ago. This is because it was only around 2.4-3 billion years ago when the first photosynthetic bacteria evolved, meaning they produce food from inorganic compounds such as carbon dioxide and water to produce glucose and oxygen. Oxygen is then released in the atmosphere and this is called <em>The Great Oxygenation Event</em>.
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Explanation:
How much carbon will turn into carbon 14 every year?
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The answer is 8. Hope this helps.
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