Question

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2. Why are the classification systems changing every now and then?​

Answer 1

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Evolution is the major factor responsible for the change in classification systems. ... Due to evolution, animal and plant species keep on changing, so necessary changes in the already existed classification systems are necessary to place every newly discovered plant and animal in their respective ranks.

Answer 2

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Millions of plants, animals, and microorganisms found on earth, have been identified by the scientists while many new species are still being discovered around the world. Therefore, to classify these newly discovered species, with new characters, new systems of classification have to be devised every now and then.

hope it helps :)