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| style="height:20px; width:200px; text-align:center;" |Orthoceras lived until 485 million years ago. When the oceans became too cold it became '''extinct'''
| style="height:20px; width:200px; text-align:center;" |The Woolly Mammoth became '''extinct''' when it lost its [[habitat]] at the end of the last [[Ice Age|ice age]] 10,000 years ago.
| style="height:20px; width:200px; text-align:center;" |Haast's Eagle was the biggest eagle to ever exist, but it became '''extinct''' when humans killed all of its [[prey]].
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| style="height:20px; width:200px; text-align:center;" |The Dodo lived on a small island with no [[predator]]s to kill it. When humans arrived, rats came with them and ate all the dodo eggs making them '''extinct'''.
| style="height:20px; width:200px; text-align:center;" |272 million years ago the [[atmosphere]] became [[pollution|polluted]] with [[Hydrogen Sulphide|hydrogen sulphide]] [[gas]], causing all the dimetrodons to [[suffocate]], making them '''extinct'''.
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===Mass Extinctions===
When a [[community]] of many different [[species]] become '''extinct''' it is known as a [[Mass Extinction|mass extinction]].
Since life began on [[Earth]] there have been 5 great [[Mass Extinction|mass extinctions]]:
*Ordovician–Silurian Extinction - 439 million years ago 86% of life on [[Earth]] was made '''extinct''' by the climate rapidly cooling.
*Devonian Extinction - 364 million years ago 75% of life on [[Earth]] was made '''extinct''' too many [[nutrient]]s washed into the oceans causing [[eutrophication]] killing sea life.
*Permian–Triassic extinction - 251 million years ago 96% of life on [[Earth]] was made '''extinct''' when [[Volcano|volcanic]] eruptions ignited coal deposits poisoning the atmosphere.
*Triassic–Jurassic extinction - Between 199 to 214 million years ago many species became '''extinct''' due to a number of events including climate change. This [[extinction]] led to the dominance of [[dinosaur]]sdinosaurs.*Cretaceous–Paleogene extinction - 66 million years ago 76% of life on [[Earth]] was made '''extinct''' due to an [[asteroid]] impact on [[Earth]]. This [[extinction]] led to the end of [[dinosaur]]s dinosaurs and the dominance of [[mammal]]s.* ... Some scientists believe we are in the middle of another [[Mass Extinction|mass extinction]] caused by [[human]]s because around 200 [[species]] are going '''extinct''' every day. ===Extra Information==={{#ev:youtube|https://www.youtube.com/watch?v=RAdNCIIYXvo}} ==Beyond the Curriculum=={{#ev:youtube|https://www.youtube.com/watch?v=t-5XXlqL1O4}} ===References=======AQA==== :[https://www.amazon.co.uk/gp/product/1782946381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946381&linkCode=as2&tag=nrjc-21&linkId=5ec5fc3f6429e30c1d9ab9bca2bccf93 ''Extinction, page 236, GCSE Combined Science Trilogy; Biology, CGP, AQA '']:[https://www.amazon.co.uk/gp/product/1782945954/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945954&linkCode=as2&tag=nrjc-21&linkId=100574c08fbbb64318256eb79ed61a76 ''Extinction, page 288, GCSE Biology, CGP, AQA '']:[extincthttps://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''Extinction, page 96, GCSE Biology; The Revision Guide, CGP, AQA '']:[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''Extinction, pages 244-247, GCSE Biology; Third Edition, Oxford University Press, AQA ''] every day:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f284 ''Extinction, pages 272-3, 312-5, GCSE Biology; Student Book, Collins, due to AQA '']:[https://www.amazon.co.uk/gp/product/1471851362/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851362&linkCode=as2&tag=nrjc-21&linkId=7d78d70a2044ee9982dae010c94af92a ''Extinction, pages 63-4, 110, GCSE Combined Science Trilogy 2, Hodder, AQA '']:[humanhttps://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f285 ''Extinction; mass, page 312-3, GCSE Biology; Student Book, Collins, AQA '']:[https://www.amazon.co.uk/gp/product/1471851338/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851338&linkCode=as2&tag=nrjc-21&linkId=425855d5890466e47189e1c21b67a1ea ''Extinctions, pages 222-3, 280, GCSE Biology, Hodder, AQA ''] activity ====Edexcel==== :[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Extinction, page 86, GCSE Biology, Pearson, Edexcel '']