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Sagot :
The evolution of cyanobacteria, which are the photosynthetic single-celled organisms did not contribute to the earth's present atmospheric concentrations of oxygen and carbon dioxide.
What is an atmosphere?
An atmosphere is a layer (or layers) of gases that encircle a planet and are fixed in place by the gravity of planetary body. A planet can sustain its atmosphere if its gravity is high and the temperature of its atmosphere is low. The layers above the opaque photosphere make up a star's atmosphere, which can contain complex molecules in low-temperature stars' outer atmospheres. Most species utilize oxygen for respiration; plants, algae, and cyanobacteria use carbon dioxide for photosynthesis; lightning and bacteria fix nitrogen to produce ammonia, which is used to generate nucleotides and amino acids; and the majority of organisms use oxygen for these processes. The paleoatmosphere gave rise to the composition of the Earth's atmosphere after being biochemically changed by living creatures for billions of years.
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