EARTH SCIENCE
CLIMATE AND ENVIRONMENTAL CHANGE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The cyanobacteria did not have a significant impact on the Earth’s climate
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Cyanobacteria absorbed carbon dioxide and released oxygen, causing global warming
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Cyanobacteria absorbed carbon dioxide and released oxygen, causing global cooling
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Cyanobacteria produced large amounts of methane, causing global warming
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Detailed explanation-1: -The release of oxygen by cyanobacteria was thus responsible for changes in the earth’s atmospheric composition, the rise of aerobic metabolism and, ultimately, the evolution of multicellularity. Oxygen is the primary molecule that makes Earth what it is today, far more hospitable and beautiful than the early earth.
Detailed explanation-2: -During the Precambrian period, how did the evolution of photosynthesis in cyanobacteria influence the Earth’s climate? Cyanobacteria absorbed carbon dioxide and released oxygen, causing global cooling.
Detailed explanation-3: -Cyanobacteria played an important role in the evolution of Early Earth and the biosphere. They are responsible for the oxygenation of the atmosphere and oceans since the Great Oxidation Event around 2.4 Ga, debatably earlier.
Detailed explanation-4: -Photosynthesis sustains a large planetary biomass on Earth. Specifically, oxygenic photosynthesis has created an oxygen-rich atmosphere and allowed the evolution of large metabolically demanding creatures.
Detailed explanation-5: -Before about 2.4 billion years ago, Earth was a virtually oxygen-free environment. The appearance of cyanobacteria, or blue-green algae, changed all that. Cyanobacteria injected the atmosphere with oxygen, setting the scene for the development of complex life as we know it.