1) Nonverbal communication plays an important role in clarifying and facilitating verbal messages during a speech. According to Mehrabian's 7-38-55 rule, 7% of meaning comes from words, 38% from tone of voice, and 55% from body language and facial expressions. 2) Speakers can establish relationships and credibility with their audience through body language like maintaining eye contact, using natural gestures, varying vocal tones, and dressing appropriately for the occasion. 3) To practice effective delivery, speakers should record themselves, focus on their message, plan ahead, and practice body language like smiling, making eye contact, and avoiding static poses.