Question

____% to ____% of isolated speech sounds are produced within the mouth and are not visible on the lips.

Answer 1

Approximately 80% to 90% of isolated speech sounds are produced within the mouth and are not visible on the lips.

Step-by-step explanation:

Speech sounds, also known as phonemes, are produced by various organs involved in the process of speech production. According to research, approximately 80% to 90% of isolated speech sounds are produced within the mouth and are not visible on the lips. These sounds are referred to as intraoral or non-visible sounds. Examples of such sounds include /p/, /t/, /k/, /s/, and /m/.