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h42 - A Brief History of Life How Did Everything Begin...

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A Brief History of Life How Did Everything Begin?
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Intelligent Design Theories (Creation Myths)
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More Stories from Around the World…
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…on how the world began…
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…all of them unique
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If the earth has existed for 4.5 billion years, what about life on earth ? Earliest evidence: cyanobacteria called stromatolites (3.4 billion years), in Australia As early as 3.8 billion years ago Earth was stable enough to support life Ribonucleic Acid (RNA)
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But where? Possibly the ocean, based on evidences Fossils Deep sea microbes Smoker fossils in China
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From single-celled organisms to complex creatures… Evolution Natural selection- helpful traits vs. harmful traits Adaptation- best suited for environment Genetic drift- independent process that produces random changes; chance Diversification in nature
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Cambrian Explosion
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The Descent of Man and the Attacks on Evolution
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The Human Story Cenozoic Era (“Age of Mammals”) Around 2.5 million years ago African Savanna Mammals including primates Humans and chimpanzees share a common ancestor between 7 to 6 million
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