A grouping of closely related classes in biological taxonomy is referred to as which of the following?

In biological taxonomy, a grouping of closely related classes is referred to as a phylum. Taxonomy is the science of naming, describing, and classifying organisms. The hierarchy of classification starts with the broadest category and becomes more specific as it progresses.

A phylum consists of multiple classes that share common characteristics and genetic relationships. For example, the phylum Chordata includes all animals that have a notochord at some stage of their development, such as mammals, birds, and reptiles, which are further divided into classes like Mammalia, Aves, and Reptilia, respectively.

Understanding this hierarchical structure is essential in biology, as it provides a framework for organizing the vast diversity of life on Earth based on evolutionary relationships.