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This extinction occurred about 440 million years ago. The cause is continental drift and subsequent climate change. Although, going into the full story, this might have happened in two waves to cause such a great extinction of 85% of all living species. Brachiopods, trilobites, graptolites and moss animals were the main species killed.

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210 million years ago, this extinction happened due to major volcanic activity causing basalt flooding, global climate change, and changing pH and sea levels. Large amphibians, crurotarsans (not crocodiles), insects and conodonts were all affected and killed.

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This extinction is also known as the K-T extinction for short and occurred around 65 million years ago. Dinosaurs, pterosaurs, plesiosaurs, mosasaurs and ammonoids were killed off from extreme asteroid or meteor impact.

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This was the largest extinction event in history, killing about 95% of all living species. Asteroid strikes, volcanic activity, climate change, and microbes were most likely the cause of this, but it's mostly unknown. It killed off marine invertebrates, land plants, plankton, insects and all life.

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The Devonian extinction happened around 365 million years ago because of lack of oxygen in oceans, fast cooling of air temperatures, volcanic eruptions, and meteors. 80% of all species were killed including coral-sponge reefs in tropics, fish and plankton.

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When the size of a population is severely decreased by natural causes such as earthquakes, floods, or fires.

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Parts that are similar in structure but have different uses in different species.

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Variation-All life forms vary in a population
Inheritance-Genetic traits inherited from parents passed to offspring
Selection-Organisms with favorable survival traits live and pass on genes
Time-Evolution takes time and happen through generations. Major changes such as specification takes longer periods of time.

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Difference in molecular similarities can be used to determine degree of relationship of species.

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The loss of genetic variation when a new population is made by a small amount of individuals from a larger population, decreasing diversity in the new population.

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An extinction event (mass extinction) is when at least half of all species die out in a fairly short amount of time.

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Bottleneck effect- Lucky vs unlucky
Founder's effect- individuals start new population with different alleles.

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The hypothesis that the development of the embryo of an animal goes through stages resembling successive adult stages of the animal's remote ancestors.

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Structures in organisms that may have no use to some, but are important to others. Ex: Appendix

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Passing on of genetic information. Influenced by male competition.

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Small errors in DNA code during cellular reproduction.

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Organisms better adapted to their environment tend to survive and produce more offspring.