Final answer:
The correct term for the phenomenon where disfluencies in a person who stutters tend to occur in clusters is called a 'stuttering cluster'. Practicing speech and becoming more self-aware can help a person achieve greater fluency. Effective communication also involves the use of appropriate gestures and expressions.
Step-by-step explanation:
The phenomenon where disfluencies in a person who stutters tend to occur in clusters more often than would be expected by chance is called the stuttering cluster. Stuttering or disfluency in speech can be a complex disorder characterized by involuntary repetitions, prolongations, or interruptions in the flow of speech.
Fluency, on the other hand, refers to the smoothness or flow of speech. Speaking with fluency means that the speech is fluid and meaningful. While practicing speech can greatly reduce occurrences of disfluency, achieving fluency is not merely about the pace of speaking; it involves minimizing interruptions and verbal fillers like 'um', 'ah', and 'like' that can distract the listener and detract from the message being conveyed.
Gestures and facial expressions are also significant aspects of communication. They can enhance the delivery of a speech by demonstrating emotion and enthusiasm, helping to emphasize points, and engage the audience. However, it is important for these to complement the verbal message and not overshadow or confuse it.