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This mass extinction occurred about 65 million years ago and is known for being the end of the dinosaurs. There are many things such as a flood basalt eruptions affecting the world's climate, combined with drastic falls in sea level and a huge asteroid or comet striking the earth that led to this extinction.

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Towards the end of the Triassic-Jurassic period three phases of extinction led to nearly half of all the species alive at the time to become extinct. The three events that led to this mass extinction were climate change, flood basalt eruptions and an asteroid impact. These events occurred about 200 million years ago.

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During the end of the Permian period, more than 96% of all of the organisms on earth died and became extinct. This extinction was caused by an asteroid impact which caused catastrophic methane release and low oxygen levels. This extinction occurred about 248 million years ago.

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After the Ordovician period came the Devonian period. About 359 million years ago, 75% of the earths population was wiped out due to change in see level, asteroid impacts,and climate change have all been blamed for this mass extinction.

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http://samnoblemuseum.ou.edu/understanding-extinction/mass-extinctions/end-ordovician-extinction/

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The first mass extinction occurred about 443 million years ago. 60% of all of both the marine and the terrestrial organisms were exterminated. This extinction was caused a major ice age that occurred in the southern that cooled the world-wide temperatures down a significant amount.

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Divergent, Parallel and Convergent Evolution.

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Divergent, Parallel and Convergent Evolution.

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Divergent:  is the combination of different traits and characteristics from groups which can lead to the formation of new species. This is when different species mate and combine their genes.

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Is the movement of organisms and/or the genetic material they possess from one area to another. If specific genes are brought somewhere where they have never been present before, genetic variations will most likely occur.

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Is the changing of the structure of genes into a new form due to the alteration of the base units that make up sections of DNA or a change in the sections of genes or chromosomes.

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Is the process in which organisms possessing adaptations and characteristics to survive in a specific region without getting killed by predators live longer than the organisms that do not possess said characteristics.

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Variation= mutation
Inheritance= DNA and sexual selection
Selection= Selection and genetic drift
Time= migration/ gene flow

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                5 mass extinction events in history.

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                5 mass extinction events in history.