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Biology- Evolution: A Retreat from Science 14.4 -FINISHED

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______ ______ involves thinking seriously and rigorously about the phenomenon of the physical universe and forming general principles to explain them.   Theoretical speculation  
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What involves looking very closely at the physical universe for the purpose of gathering scientific knowledge about it?   Observation  
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_________ is a special kind of observation that involves testing theoretical speculations in a controlled and systematic way.   Experimentation  
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What does the process of testing ensure?   That over the long run scientific theories which contain errors will be eliminated  
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Mainstream scientists and science journals now regularly discuss the ________ ________, a quasi-religious idea that states that the earth and all the living things that inhabit it constitute a single living thing.   Gaia hypothesis  
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