Why are Zapotec and Mixtec described as language complexes?

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The Zapotec and Mixtec groups are described as language complexes because they consist of multiple, distinct varieties that are often mutually unintelligible, rather than a single, uniform language.12

In linguistic classification, these terms are used to acknowledge that the precise number of individual languages within each complex has not yet been determined definitively. While these varieties share a common ancestral origin within the Otomanguean phylum, they have diverged significantly over time, resulting in a collection of related but distinct speech forms spoken across regions such as Oaxaca, Puebla, and Guerrero.13