Answer:
Varieties of language develop for a number of reasons: differences can come about for geographical reasons; people who live in different geographic areas often develop distinct dialects—variations of standard English.
The study of language variation guides language development activities. For example, when developing a writing system it is desireable for it to be useful and acceptable to the largest number of speakers of the language. Therefore, it is important to identify the most unifying features of the language.
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