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Evolution and extinctionBy Wan-Jiung HuThe third explanation is sea level change. Sea level change has been associated with all Big Five massive extinction events, and this phenomenon is highly agreed by most scientists. Sea level falls are found in the four massive extinction events. The lowest sea level was noted in the largest extinction event-End Permian extinction. Thus, sea level change is highly linked to massive extinction events. Researchers think that sea level fall can let animals and plants habiting in shallow sea to die. However, this theory cannot explain why continental plants and animals also died during these massive extinctions. There must be other reasons to explain the sea level change. In my opinion, sea level change is only a secondary event caused by global climate change. [...]Global cooling can let plants to release more CO2 which is composed of carbon-12. Plants can affect one-seventh CO2 concentration on earth each year. In addition, negative carbon excursion can be due to increased organism burial and decreased organism productivity during massive extinction. And, End-Permian period is related to global cooling not global warming.
There would likely be a few "causes".ClimatologicalAsteroid (also related to climate).Shifting continents could cause climate changes too.Sea level changes.Resource depletion.New kid on the block.DiseasePretty much anything that could close a niche.
and of course 'Self Destruction'
"Recently" what has been happening is that when the temperature plunges.The partial pressure of Carbon Dioxide (CO2) over the oceans drops.This causes the oceans to absorb atmospheric carbon dioxide over a period of time (perhaps a few thousand years).And, thus the levels of atmospheric carbon dioxide drop.