In biological classification, the taxonomic hierarchy follows a specific order: Kingdom, Phylum, Class, Order, Family, Genus, and Species. Each rank represents a category of classification.
A Genus is a taxonomic rank used in the biological classification of living and fossil organisms. It comprises a group of related species which have more characters in common in comparison to species of other genera.
Option (A) describes an Order (a group of related families). Option (D) correctly identifies that a Genus is an aggregate of closely related species (e.g., Panthera leo and Panthera tigris both belong to the genus Panthera).
Final Answer: D
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