Biology

Biology, 17.07.2019 17:30, peno211

The major source of oxygen in earth's early proterozoic atmosphere is inferred to have been produced by

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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, 01.10.2019 14:30, 20jhuffman

What did the miller-urey experiment demonstrate? earth's early atmosphere contained abundant oxygen. early earth was constantly bombarded with comets. small organic molecules formed from gas mixture of earth's early atmosphere. organisms were spontaneously generated on early earth.

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Geography, 09.10.2019 14:50, KariSupreme

Need ! plzz which statement explains why the organisms that require oxygen today owe their existence to the early autotrophs on earth? (a)autotrophs cleaned earth’s water so that modern organisms could drink it. (b)autotrophs produced oxygen as a waste product, which built up in the atmosphere. (c)autotrophs used the methane that was present in early earth’s atmosphere.

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Geography, 29.10.2019 15:31, mikeylaaliz5901

Early in the earth's history there was little to no oxygen into atmosphere. how did oxygen levels in the atmosphere reach current levels? a) volcanoes released oxygen from within the earth. b) the earth captured oxygen from space with its gravity. c) water molecules on the earth were broken to release oxygen. eliminate d) early bacteria and plants released oxygen through photosynthesis.

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The major source of oxygen in earth's early proterozoic atmosphere is inferred to have been produced...

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