Thus, changes in the composition of the earth's atmosphere, the emergence of aerobic metabolism, and finally the development of multicellularity were all brought about by cyanobacteria's release of oxygen.
Oxygen is a chemical element, a type of substance, due to its unique atom composition. The atomic number 8 of an oxygen atom, which is represented by the symbol O in its formal chemical formula, indicates that the oxygen atom contains eight protons in its nucleus.
All living things require oxygen, which is a clear, flavorless cloud of gas. Animals swallow it, which they subsequently transform into carbon dioxide, which plants utilize to produce new carbon and release oxygen.
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