How to diversity organisms
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Diversity in organisms refers to the millions of varieties of organisms that inhabit the earth. These organisms need to be classified so that their study becomes easier. It allows their identification and subsequent categorization on the basis of the structure and function.
Scientists classify organisms by choosing the basic characteristics.
The basic characteristics that account for the broadest divisions among living organisms should be independent of any other characteristics in their effects on the forms and structural functions of the organisms. Within the broadest groups, smaller subgroups are decided by picking up the next set of differentiating characteristics. This process of classification within each group can then continue using new characteristics each time.
Basic criteria such as nature of cell, cellularity, and mode of nutrition were used by Whittaker to classify the whole living organisms into five kingdoms.
In addition to the characteristics used by Whittaker, the scientists use the characters like the external and internal structure of the cell, development processes, ecological information, phylogenetic relationships, and chemical constituents of organisms to classify living organisms.
Based on these characters, organisms are classified into various categories. The major categories include Kingdom, phylum, class, order, family, genus, and species.
Hope this clears your doubt.Regards.