It is believed Earth may be in the midst of another mass extinction‚ also known as ’The Sixth Mass Extinction ’. This mass extinction is the first for 65 million years since the Cretaceous-Tertiary period. "It ’s the next annihilation of vast numbers of species. It is happening now‚ and we‚ the human race‚ are its cause ’ (Leakey‚ 1995). Every year‚ between 17‚000 and 100‚000 species vanish from our planet‚ which will result in fifty per cent of the Earth ’s species vanishing inside the next 100
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Task 9: Mass Extinctions Introduction: In this report I will talk to you about the 5 mass extinctions that have happened on earth over the past 434 million years. I will also talk to you about the effects of the current mass extinction. The last things i will show is a list of 10 recently extinct species and 10 endangered species. Number 1: The Ordovician Silurian Extinction This extinction happened about 439 million years ago‚ because of a drop in sea levels as glaciers formed. An ice age has been
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consequences of the removal/extinction of an organism from the food web? The extinction or removal of an organism from a food web can affect different organisms directly or indirectly‚ depending on the trophic level the organism is and in what role they play in the food web‚ if it is carnivore‚ herbivore‚ omnivore‚ etc. Extinction has also been important for evolution in food webs. Some food webs are generated from the reaction with repeated extinctions‚ and the extinction rate is affected by food
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Dear Editor‚ I’m a regular reader of the Sunday Times and recently I came across Jeremy Clarkson’s article “Stuff the tiger – long live extinction”. Upon reading it‚ allow me to say‚ I strongly disagree with his beliefs and points of view and the way in which he describes them. I’m fond of this animal not only on a professional but also personal level‚ as I grew up in an area where tigers were idolized and preserved‚ which gives me plenty of reasons to criticise this piece. This article violates
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In the article titled “Meteor likely caused the Earth’s Greatest Extinction Event” the author states that “About 60 meteorites five or more kilometers across have hit the earth in the past 600 million years. The smallest ones would have carved craters some 95 kilometers wide. “Most scientists agree that one such impact did in the dinosaurs‚ but evidence for large collisions coincident with other mass extinctions remained elusive until recently.”The increased attention brought about the discovery
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triggered mass extinctions on the lands and in the oceans so profound that they define the geological boundary between the older Mesozoic Era‚ often called the "Age of Reptiles‚" and the modern Cenozoic Era‚ the "Age of Mammals." <br><li>On a finer scale‚ the extinctions define the boundary between the Cretaceous (geological symbol‚ "K")‚ and Tertiary ("T") periods. This mass extinction is usually referred to as the K-T extinctions. The dinosaurs became extinct during the K-T mass extinction. To examine
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To have a better indication of what actually happens during anoxic events‚ the Cenomanian-Turonian boundary event will be discussed as a case study. During this time period‚ two anoxic extinction events happened. The earth’s oceans lacked oxygen for nearly half a million years‚ causing the extinction of approximately 27 percent of the marine invertebrates (Turgeon‚ 2008 p. 16). As expected‚ the global environmental disturbance increased atmospheric and oceanic temperatures. A possible cause was
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went extinct. This mass extinction is known as the Cretaceous-Paleogene (K-Pg) extinction event. The Cretaceous was the last period of the Mesozoic Era which is when dinosaurs lived from about 250 to 65 mya and the Paleogene is the first period of the Cenozoic Era that started about 65 mya which is the Era that we are currently living in. So the extinction event marked the end of the Cretaceous period and the beginning of the Paleogene period hence the name of the extinction event and the start of
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hypotheses put forward for the mass extinctions at the end of the Permian and Cretaceous (KT) Periods. A mass extinction is an event in which at least 25-75% of species in the global environment are eradicated in a short period of time. Where as a regional extinction event is when the extinction is confined to a specific zone. Five mass extinctions have occurred throughout time‚ two of the most well known of these are the Permian and Cretaceous extinction events. There are several hypotheses
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number of families (Sepkoski‚ 1986) and an estimated 96% extinction at the species level (Raup‚ 1979). Oceanic life suffered the most but terrestrial life forms were also greatly affected. There was a 77% reduction in the number of tetrapod families (Maxwell and Benton‚ 1987). All major groups of oceanic organisms were affected with the crinozoans (98%)‚ anthozoans (96%)‚ brachiopods (80%) and bryozoans (79%) suffering the greatest extinction (McKinney‚ 1987). The end of
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