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As we explore new and new areas, we are getting new and new organisms. We need to classify the newly found organism. So for that we are finding new new classification systems which can include new new organisms..
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In any branch of science nothing is written in concrete. Theories keep on changing as more relevant and correct theory are being discovered. In case of living beings certain species become extinct and some new species is being formed in every era. This process of addition and deletion of species necessitates the continuous change of the classification system.
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