How are vowels categorized based on which section of the tongue is elevated during their articulation?

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Vowels with rounded lips and vowels without rounded lipsVowels produced with the front part of the tongue and those with the back partVowels articulated with the tongue positioned high and those with it lowVowels distinguished by tense and lax tongue muscle tension

Explanation

Vowels are classified according to the portion of the tongue that is raised during their production. Specifically, they are divided into front vowels, where the front of the tongue is elevated, and back vowels, where the back of the tongue is raised.