Ethnolinguistics is part of historical linguistics. a. true b. false

True

Explanation:

Ethnolinguistics is a branch of external linguistics distinguishable from linguistic anthropology.

Regarding the lexicon, ethnolinguistics can study phenomena such as the conformation of vocabulary according to the environment, the influence of prominent sectors of culture in the lexical analysis of reality or the influence of ideology on the connotations acquired by words.

In the grammatical field, this discipline can analyze the grammatical changes associated with cultural changes, the conformation of the classifiers according to the culture or the influence of cultural tendencies in the derivative morphology.

Regarding communication, ethnolinguistics can complement what discourse analysis analyzes about the effective use of language in communication.

the previous answer given.