The process of biological classification helps to understand the evolutionary relationships between organisms on the basis of the characteristics of other organisms that are members of these existing groups and subgroups. So option 'D' is correct.

Classification of living organisms serves several practical purposes:


Classification helps in understanding the relationships and similarities between different organisms. By categorizing organisms into groups based on their shared characteristics, scientists can infer evolutionary relationships and hypothesize about the origins of life.


Classification provides a framework for studying the evolutionary history of organisms. By organizing organisms into hierarchical groups, such as kingdoms, phyla, classes, orders, families, genera, and species, scientists can track the changes and adaptations that have occurred over time. Classification also helps in identifying common ancestors and understanding the branching patterns of evolution.


Classification provides a standardized system for naming and identifying organisms. The scientific naming system, known as binomial nomenclature, assigns a unique two-part name to each species. This system, developed by Carl Linnaeus, ensures that every organism has a distinct and universally recognized name, preventing confusion and facilitating communication among scientists.


Classification aids in the identification and categorization of unknown organisms. By comparing the characteristics of an unknown organism with those of known organisms, scientists can classify it into the appropriate taxonomic group. This allows researchers to quickly identify and study new species, understand their ecological roles, and determine their potential importance to human health and the environment.

In summary, the practical purpose of classification of living organisms includes explaining the origin of life, tracing evolutionary relationships, providing a standardized naming system, and facilitating the identification of unknown organisms. This classification system helps scientists organize and understand the vast diversity of life on Earth, enabling further research and exploration in various fields such as ecology, medicine, and conservation.