What taxonomic group contains one or more species?

The taxonomic group that contains one or more species is known as a genus. In biological classification, a genus is a rank that groups together species that are closely related and share a common ancestor. It serves as a way to organize species into manageable categories, allowing for easier identification and study of their relationships. For example, in the genus Homo, which includes species like Homo sapiens (modern humans) and Homo neanderthalensis (Neanderthals), both species share important characteristics and evolutionary traits that justify their grouping under one genus.

Higher taxonomic ranks, such as family, order, and class, encompass broader categories that include multiple genera. While these larger groups also contain one or more species, the genus is the specific taxonomic unit that directly encompasses a related group of species, making it the correct choice in this context.