Question

why are classification systems changing now and then ?

Answer 1

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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.

Answer 2

Answer:

The evolution is the major factor which is responsible for the change in classification system. Since, evolution still continues, so many different species of plants and animals which are added in the already existed biodiversity.