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Lecture 11Early Ideas - The History of Evolutionary Thought...

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NATS 1690 - Early Ideas 1 The History of Evolutionary Thought 1. Early Ideas
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NATS 1690 - Early Ideas 2 References Custom Textbook – An Introduction to Biological Evolution , 2009 Pages 62 - 73
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NATS 1690 - Early Ideas 3 Lecture Topics Early Ideas Anaximander, Xenophanes, Empedocles, Aristotle, Lucretius The Middle Ages
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NATS 1690 - Early Ideas 4 Early Ideas Some early Greek philosophers taught that the sun, Earth, life, humans, civilization, and society emerged over eons without divine intervention That life came from the air, water, earth… Some suggested a that one “form” changed into another This was “Evolution” Presented rudimentary notions of natural selection & competition Others believe that once formed, organisms remained fixed This was not Evolution
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5 Argued that life arose from the seas & underwent modification once it established itself on land i.e., The Earth changed throughout history Life took on different forms during each new stage of the Earth’s development Life underwent modification Suggested an aquatic descent of man At first, Earth was mostly water & there were only fish with “thorny” skin Humans ‘existed’ inside these fish Then - sun dried some of the water & land appeared Some of the fish moved to the land When land conditions were right, humans emerged – lived independently Anaximander (ca 611 BC) http://www.iep.utm.edu/a/anaximan.htm (see Part 8: Biology) A Thorny-back Cowfish Fish photos: http://www.amonline.net.au/fishes/fishfacts/fish/lfornasini.htm
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NATS 1690 - Early Ideas 6 Anaximander in Summary 1. No divine creation 2. Proposed that the Earth changed 3. And that life changed as Earth changed 4.
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