l think the most important reason for evolution is a theory because it can not be prove vividly or precisely by our telenogy now.lt may be wrong or not totally correct,so it suppose not be a law.lt is just a good and beliveable demonstration.lt will be replace by more advanced and nicely theory in the future.Also,the earth occurs in this universe for a long time.lt's very hard to observe it clearly.Evolution theory can't be one hundred percent right.ln short,it's not a law because it depends some scientists' guess,and don't have enough essential details to show it is true without any doubt.
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