Why are Classification Systems Changing Now and Then?

As we all know that 8.7 millions living organisms are already discovered in our earth. Still there are many unknown undiscovered area in universe. May be it will take many years. Even the areas that already have been invaded but still all the floras and fauna remain undiscovered. So, every year almost fifteen thousand organisms are discovering. For this invent of new species it has been essential to make changes in classification system every now and then.













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