So what's the difference between a law and theory?
Gravity is a theory yes, but not that their is gravity, but how it behaves... Hence micro and macro evolution..
Evolution exists to some point, but how does it behave? Not completely known
English
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Gravity exsists can you see it? No God exsists can you see him? No Space exsists. Can you see it? No
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A law is generalizes an body of observations based on the theory, law show how something behaves, but not why it happens. Evolution does exist, thats why it is a field of study.