What taxonomic group contains one or more families?

The taxonomic group that contains one or more families is the order. In biological classification, the hierarchy of taxonomic ranks starts from broader groups and becomes more specific. The order is a higher taxonomic rank that encompasses a collection of related families that share certain characteristics.

For instance, consider the order Carnivora, which includes various families such as Felidae (cats) and Canidae (dogs). Each of these families contains genera and species, but it's the order level that aggregates these families into a larger grouping based on shared traits and evolutionary relationships.

This structural organization facilitates the classification of biological diversity and helps in understanding the relationships among species in the tree of life. Other groups like class and phylum also contain multiple families but represent broader or different levels within the biological hierarchy, which does not directly answer the original question focused on families specifically.