UNIVERSE
SOLAR SYSTEM FORMATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which gas was introduced by stromatolites and allowed for more complex life to exist on Earth?
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oxygen
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carbon dioxide
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sulfur oxides
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water vapor
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Explanation:
Detailed explanation-1: -Stromatolites are sedimentary rocks formed by the growth of layer upon layer of cyanobacteria, a single-celled microbe that gets energy through photosynthesis, releasing oxygen as a by-product.
Detailed explanation-2: -Even more dramatically, the photosynthesis carried out by the stromatolites was on such a large scale that they consumed most of the carbon dioxide in the atmosphere and released enough oxygen to make permanent changes.
Detailed explanation-3: -Stromatolites are large, layered structures built up by mats of cyanobacteria.
Detailed explanation-4: -Nitrogen gas in the atmosphere does almost nothing, but nitrogen elsewhere on Earth is essential for life.
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