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Period 7
Mrs. Nickerson

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changes in the sequence composition of cellular molecules such as DNA, RNA, and proteins across generations.

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development of an organism expresses all the intermediate forms of its ancestors throughout evolution

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a number of putative human vestigial features, includes muscles of the ear, wisdom teeth, the appendix, the tail bone, body hair

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A bone or an organ that appears in different animals

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Owing to the chance disappearance of particular genes as individuals die or do not reproduce.

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arousing through preference by one sex for certain characteristics in individuals of the other sex.

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Divergent, Parallel and Convergent Evolution

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Divergent, Parallel and Convergent Evolution

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Divergent: Two or more related species becoming less similar.
Parallel: Two different species evolve similarly because of lifestyle.
Convergent: Organisms with different ancestors become more alike.

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seasonal movement of animals from one region to another.

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A changing of the structure of a gene. Caused by the alteration of the single based units in DNA.

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Nature selects what types of organisms survive and which ones breed more.

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V: Variation
I: Inheritance
S: Selection
T: Time

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65 million years ago, around 77% of life was gone. Just like the Triassic-Jurassic Extinction it was most likely a combination of volcanic activity, asteroid impact, and climate change

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199 million and 214 million years ago, there are claims being made that the extinction was caused by an asteroid impact, climate changes, and flood basalt eruptions.

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251 million years ago, 96% of all organisms land and ocean were killed. It was caused by an enormous volcanic eruption that filled the air with carbon dioxide, it then fed all types of bacteria that then began emitting large amounts of methane. The oceans then became acidic and the Earth was warming.

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364 million years ago, around 75% of all land organisms were gone. It is unclear whether the extinction was one single event or if it was spread out over a course of hundreds of thousands of years.

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439 million years ago, most of the land animals were wiped out. Most likely was caused by glaciation and the falling sea levels.