Scientists grouped all living things into two kingdoms plants and animals. Over time, scientists continued to learn about organisms. They found that many living things did not fit well in either group. the number of cells in their bodies.
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. This creates the requirement to change the existing systems of classification.
Classification is defined as the establishment of a hierarchical system of categories on the basis of presumed natural relationships among organisms.
Scientific advancements have contributed to these changes are as follows:
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