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We are having millions of organisms on this earth .It is really difficult to point a single one from all those . So we need to classify them on some features. Organisms are classified in to groups based on their similarities and differences. If that grouping is based on some of their biological characters, then they are called as biological classification. It makes the job of identification easy. We feel it easy to find some organisms with some specific features
The number of organisms present on the earth is its very difficult to identify each and every the organisms are classifiedusing their special features like physical features. behaviour etc.