ch22 - Chapter 22 Principles of Evolution Why are there so...

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Principles of Evolution Why are there so many species? Evolution o Descent w/ modifications o A phase used in proposing that Earth’s many species are descendants of ancestral species that were different from present-day species What is science? The observation, identification, description, experimental investigation, and theoretical explanation of phenomena Such activities restricted to a class of natural phenomena Physics Chemistry Biology The Science of Biology All events can be attributed to natural causes Natural laws apply at all places and all times People perceive events in similar ways Theory vs. Hypothesis Theory o General explanation of natural phenomena, developed through extensive and reproducible observations Hypothesis o Tentative explanation of observations o Educated guess The Scientific Method Observation o Something unexpected happens Hypothesis o Explanation o If/then prediction Experiment o Controlled test o Challenged prediction Conclusion o Supports or doesn’t support hypothesis Scientific Theories General statements about how things operate
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ch22 - Chapter 22 Principles of Evolution Why are there so...

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