Final answer:
Stage 2 Voicing is a critical step in voice production where the vocal folds vibrate to produce sound.
Step-by-step explanation:
In the context of biology, the RVT Hierarchy refers to the stages in voice production. Stage 2 Voicing is a critical step in the process where the voice box or vocal folds vibrate to produce sound. It is during this stage that the overtones and intensities vary with mouth shaping and tongue position to form different sounds.