Biology

Biology, 01.08.2019 23:00, jaimes04

It took approximately years for oxygen to become a large component of earth's atmosphere

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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, 06.10.2019 13:30, XVARYX

According to scientific evidence, earth’s earliest atmosphere lacked oxygen. over time, oxygen was added to the atmosphere. which statements explain how this change occurred and how it affected life on earth? choose all answers that are correct. a. the addition of oxygen to the earth's atmosphere make possible the development of eukaryotic organisms, which need oxygen to carry out many of their life processes.

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Geography, 20.10.2019 21:30, dhernandez081

Study the graph about oxygen content of earth’s atmosphere. oxygen content of earth apostrophe s atmosphere line graph. x axis is millions of years before present. y axis is oxygen in volume percent. the line starts at 1000 millions of years before present at 4 percent oxygen, remains level until 625 millions of years before present, increases quickly to 13 percent oxygen, then increases slowly to 18 percent oxygen. the line jumps to 35 percent oxygen near 300 millions of years before present, drops quickly to 15 percent oxygen, then increases to 31 percent oxygen near 100 millions of years before present, before dropping down to 20 percent oxygen. which describes oxygen content as earth evolved over time? oxygen levels sharply declined about 400 million years ago. oxygen levels stay above 15 percent starting 200 million years ago oxygen levels remain below 5 percent starting 1000 million years ago. oxygen levels raise significantly between 1000 and 700 million years ago.

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Biology, 23.10.2019 00:00, lizdeleon248

The great oxygen event marks the time, approximately 2.5 billion years ago, when there was enough oxygen in the atmosphere to support a major burst of life on earth there was a cataclysmic weather event that absorbed most of the oxygen in the atmosphere and locked it into iron deposits in the oceans there was significant oxygen in the atmosphere there was a massive volcanic eruption that lead to a very rapid increase in oxygen levels on earth photosynthesis was clearly established and producing oxygen.

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