the five cataclysmic mass extinctions‚ and as of today‚ about 99.9 percent of all species that have existed on Earth are extinct. These five extinctions were the Ordovician-Silurian extinction‚ the Late Devonian extinction‚ the Permian-Triassic extinction‚ the End Triassic extinction‚ and the Cretaceous-Tertiary extinction. They wreaked havoc on more species than you could imagine‚ and if you think today that there are a lot of species‚ imagine if the five mass extinctions hadn’t happened. The Ordovician-Silurian
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Physical Geology Essay Assignment: Mass Extinctions Topic: The Cretaceous - Tertiary extinction Submitted by Suhaidee Yusoh ID No. 15240 Petroleum Geosciences UNIVERSITI TEKNOLOGI PETRONAS The Cretaceous-Tertiary extinction 1. Introduction Fastovsky‚ D.E. and Weishampel‚ D.B.‚ 2005 defined the mass extinction “Mass extinctions involve large numbers of species and many types of species undergoing global extinction in a geologically short period of time”‚ organisms have gone extinct‚ certainly
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BIOL2110- Vertebrate Zoology Word count: 1056 Dinosaur extinction: An analysis of events and theories that possibly led to the dinosaurs’ demise. Ever since the history of Earth has been studied using fossil records‚ extinctions have always been the object of fascination and interest‚ particularly the mass extinctions that occurred throughout Earth’s history. A mass extinction can be caused by disruptive global environmental changes‚ where large numbers of species have become extinct (Urry
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1 To what extent does the impact theory explain the extinction of the dinosaurs? Dominic Pharaoh 5A Promoter: Harriet Gibson 2011-2012 Dominic Pharaoh 5A Promoter: Harriet Gibson 2 Table of contents I. II. Introduction ......................................................................................................................... 3 The impact theory and the alternative hypotheses .......................................................... 6 A. 1. The impact
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way of knowing but in P.B. Medawar’s words‚ “The art of the soluble.” Science has explanations to several unusual activities throughout the world that had taken place even before mankind existed and their research still goes on. The study on the extinction of dinosaurs is a timeless study but nowadays the young generation who go to college are not that interested in these studies. Stephen Jay Gould argues that‚ “science is a fruitful mode of inquiry and not a list of conclusions‚ and that the conclusions
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A number of different theories have been assessed throughout the course of this research to attempt to reach a conclusion as to the reason behind the extinction of the Tyrannosaurus Rex. Although all arguments are credible‚ and supportive with educated information and data‚ the most conclusive theory of all is The Alvarez Asteroid Impact theory. Alvarez‚ a researcher at the University of California‚ discovered a pencil thin layer of Iridium around the rocks in Gubbio‚ Italy. (New Scientist‚
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Extinction of Dinosaurs Ryan Humphries Biology 6th Period Two-hundred and thirty million years ago the first dinosaur-like creature roamed the earth. Within five million years it could be considered a dinosaur. They were soon at the top of the food chain. They populated every continent. Then 65 million years ago they vanished. The most powerful creatures ever to live on earth had become extinct. Dinosaurs were not the only victims of this "mass extinction." There were many other species
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“De-extinction Probably isn’t Worth it”. This is the name of an article by Sarah Zielinski. I completely understand what she is talking about in her text‚ and I agree with her. De-extinction isn’t worth it mainly because it would take attention from other research‚ harm living creatures‚ and most of their habitats and food are gone. If we brought back extinct animals‚ it would take a lot of funds and research‚ causing us to forget about other research projects. In Mrs. Zielinski’s article she told
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extinction is the end of an organism or of a group of organisms (taxon)‚ normally a species. Ordovician-Silurian extinction‚ global extinction event occurring during the Hirnantian Age (445.6 million to 443.7 million years ago) of the Ordovician Period and the subsequent Rhuddanian Age (443.7 million to 439 million years ago) of the Silurian Period that eliminated an estimated 85 percent of all Ordovician species. This extinction interval ranks second in severity to the one that occurred at the
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The Sixth Extinction According to the information given by Niles Eldredge‚ about 30‚000 species go extinct annually. The first five major extinctions that have happened in the past were due to natural causes. The first started with severe and sudden global cooling and lost 25% of families. The second happened near the end of the Devonian Period and may or may not have been the result of a global climate change of which 19% of families were lost. Evidence suggests that a bolide impact similar
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