Chapter 14 Notes

Chapter 14 Notes - >Evolution by natural selection is a...

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Biology 1421 Chapter 14 Notes Principles of Evolution 14.1 How did evolutionary thought evolve? > Early Biological thought did not include the concept of evolution. >Exploration of new lands revealed a greater diversity of life. >A few scientists speculated that life had evolved. >Fossil discoveries showed that life had changed over time. >Some scientists devised non-evolutionary explanations for fossils >Geology provided evidence that Earth is exceedingly old. >Some pre-Darwinian biologist proposed mechanisms for evolution. >Darwin and Wallace proposed a mechanism of evolution. Early evolutionary thought
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Unformatted text preview: >Evolution by natural selection is a unifying theme for all of biology >The foundation of evolutionary thought developed gradually over centuries >Main ideas of evolution were not widely accepted until after Charles Darwin published On the Origin of Species in 1859 >Heavily influenced by theology-All organisms were created simultaneously-Each distinct life-form was permanently fixed and did not change over time >Expressed by ancient Greek philosophers-Plato (427-347 B.C.)-Aristotle (384-322 B.C.) arranged all organisms on a linear scale of increasing complexity (“ladder of Nature”) 1...
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