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    The Cretaceous Extinction Event

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    Cretaceous Extinction Event Causes, Evidence, and Effects on Biodiversity The most significant event of the Cretaceous era came at its end. Nearly 65 million years ago, the second most severe mass extinction in earth’s history occurred. This resulted in the loss of around 80% of species living at the time. Though nowhere near as severe as the end-Permian mass extinction, the end-Cretaceous extinction is the most well known mass extinction event. This is due to the violent event that caused

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    Cretaceous–Paleogene extinction event Over 98% of all organisms that have lived on Earth are now extinct. A mass extinction event occurs when a large number of species die out within a small time frame (relative to the age of Earth). Mass extinctions are intensively studied for both cause and effect, as there is usually room for debate regarding catalysts that precede the extinction and the massive influx of new biological species that follows. There have been five major mass extinctions, dubbed the “Big

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    cusp of the sixth mass extinction, as estimated the event to be occurring within 2200 years. Scientists have evidences supporting this statement with the extinction rates and magnitudes, and comparing the present conditions to the past “Big Five”—the previous five mass extinction events. Mass extinction is generally known as the forever disappearance of 75% of lives in the globe, therefore species lost is the main driver of such extinction events. With the current high extinction rates and increasing

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    Introduction The Permian-Triassic extinction event is undoubtedly the largest extinction event the Earth has ever seen. While evidence shows that it occurred over a great amount of time, it was effective in causing the extinction of an incredibly large portion of life on Earth. To such an extent that it took millions of years before any large amounts of biodiversity occurred again. This is why it is also referred to as the ‘Great Dying’. This paper will will analyze the survivability of terrestrial

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    The Extinction Event and Life in the Post-Apocalyptic Greenhouse The biggest mass extinction of the past 600 million years (My), the end-Permian event (251 My ago), witnessed the loss of as much as 95% of all species on Earth. Key questions for biologists concern what combination of environmental changes could possibly have had such a devastating effect, the scale and pattern of species loss, and the nature of the recovery. New studies on dating the event, contemporary volcanic activity, and

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    A lot of people believe that an extinction period is always a bad thing. This is not true, extinction periods can be and have been really good things. Extinctions periods have been very useful to humans. If it weren’t for extinction periods everything that we know of today wouldn’t be here. Extinctions open the opportunity for some species to evolve and thrive. This is how most of the species on earth today are here. Are ancestors were able use the extinction of another and more dominant species

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    our existence? In short, how do we survive? Research suggests that space exploration and colonization is of vital importance to mankind, because our planet has a finite resource base for future populace support, we are at an increased risk of mass extinction without dissemination and cosmic expeditions promote innovation to stimulate growth and technological advancement. In our brief history, Homo sapiens have occupied our planet for nearly 200,000 years. From our origins, we banded together in small

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    The Ordovician Period

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    ORDOVICIAN PERIOD The Ordovician Period is the second period of the Paleozoic Era and began 485.4 million years ago and ended 443.4 million years ago (when the Silurian Period began). Four continents were present and separated by three main oceans. Laurentia was composed of present-day North America, part of Scotland, and Greenland and was near the equator. Siberia-Kazakhstan was east of Laurentia, slightly north of the equator. The Iapetus Ocean separated these two masses on the south from the

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    Precambrian Era The Precambrian era laster 4600-541 million years ago. During this time, there were no plant life on the planet. Most of the things that were on the planet were rocks. The most common type of rock was Isua greenstone. Most rocks have been eroded away, subducted, or metamorphosed. During this time, the atmospheres and oceans were formed, plate tectonics began to build up continental masses. The air during this time was mostly made up of water vapor, carbon dioxide, and nitrogen. Later

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    Devonian Period

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    The mass extinction of Marine-life in the Silurian Period opened up endless possibilities and potential for terrestrial life in the next Geologic time period, The Devonian Period. The Devonian Period served as an introduction to the expansion of the first amphibians, sharks, and some of the first plants with roots, leaves, and stomata. Despite such significant advances, the Devonian Period is best known for its diversity and abundance of underwater life. Not only did fish with cartilage begin to

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