Question

Butterflies, jaguars, eagles, flounders, snakes, giraffes, trees, humans, and so on, breathe in dioxygen, also called oxygen gas (O₂). Today, we take it for granted, but this gas was not always found in Earth's atmosphere. One theory explains that oxygen appeared on Earth thanks to the amazing photosynthetic biochemistry of huge numbers of bacterial cells called cyanobacteria. In two paragraphs: are cellular cyanobacteria really responsible for the origin of oxygen gas in the air of this planet? Really? Can cells do this at the scale of transforming a whole planet?  Discuss the importance and significance of cyanobacteria in what has been called "the Great Oxygenation Event.

Answer 1

First I am telling about Great Oxidation Event, this it was one of the most important things to happen on this planet without it. There could never have been any animals that breathe oxygen and other. Scientists have long suspected that life itself was responsible for creating the air that we breathe.

But they found that life itself was undergoing a transformation just before the great oxidation event, these are -photosynthesis and cyanobacteria

Now Q1 Yes

Q2 Yes, cells do this at the scale of transforming a whole planet.

Q3.from the bacteria's point of view, photosynthesis has one irritating downside. it produces oxygen as a waste products. oxygen is no use of them ,so they released it into the air, But cyanobacteria puming out unwanted oxygen that transforming earth's environment, So it is called Great Oxygen Event.