Each person has thier own opinion on what the greatest sceinctific discovery has been. I think that it has been darwin's therroy of natural selection. I think this is it because since we have made this dicovery, we have been able to better know were we come from. We have learned that over the years populations change. 
      Darwins theroy of natural selection is basicllly suvival of the fittest. If one animals with a mutation lives longer than one without the mutation that mutaion might be spread through out the entire population thus the population has evolved. this is good because with the mutaion, everyone can work and finction better. Mutations aren't always good. Some mutations are bad, and hopefully the animal carring the mutation dies before it can reporduce and spread it throught the enitre poputation. This is the theroy of natural selection. 



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