Biology
Biology, 22.07.2019 16:50, Brightcord9679

The large amount of free oxygen in earth's present atmosphere is primarily a result of

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Biology, 16.07.2019 01:30, whitethunder05
Why was the evolution of photosynthesizing bacteria important to most modern organisms? these bacteria released free oxygen into earth's atmosphere for the first time; as their numbers grew, the amount of oxygen in earth's atmosphere grew?
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Chemistry, 30.07.2019 22:30, Gabby1128
Which statement describes a process involved in the evolution of earth’s early atmosphere? - cyanobacteria transformed carbon dioxide in the atmosphere into oxygen during photosynthesis. - heavier gases escaped through earth’s atmosphere, leaving only lighter gases such as oxygen behind. - volcanic eruptions produced enough oxygen to create earth’s atmosphere. - the amount of oxygen in the atmosphere declined due to respiration, or breathing.
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Biology, 02.08.2019 03:00, omar1511
Photosynthetic organisms were present when earth was primarily anoxic. why was the appearance of cyanobacteria critical for the oxidation of the atmosphere? view available hint(s) photosynthetic organisms were present when earth was primarily anoxic. why was the appearance of cyanobacteria critical for the oxidation of the atmosphere? the early forms of photosynthesis did not produce oxygen as a waste product. cyanobacteria carry out anoxic photosynthesis. the early forms of photosynthesis did produce oxygen, but it was not enough to make a difference in the atmosphere. the early forms of photosynthesis were carried out in the water, and there was no way for the oxygen to move into the atmosphere.
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Biology, 20.09.2019 15:20, Cloudy76
If the force of gravity were to decrease on earth, what might happen to the earth's atmosphere? a) the amount of oxygen would increase as the earth's atmosphere compressed b) the amount of carbon dioxide woukd increase as the earth's atmosphere spread out c) all of the gases of the atmosphere would spread out as a result of less gravity, making it harder to breathe d) there would be no impact to the earth's atmosphere with a change in gravity
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