Final answer:
Nonverbal messages are sent through channels like facial expressions, gestures, sight, and scent, and are often culturally specific. Visual cues and paralinguistics play a significant role in nonverbal communication.
Step-by-step explanation:
Nonverbal messages are sent through various channels or means beyond verbal language, such as sound waves. These include facial expressions, gestures, and body language, which are symbolic forms of communication largely learned through one's culture. In addition, nonverbal communication can also be transmitted via sight, and sometimes through scent, when considering human communication on a broader scale that includes similarities with animal communication methods.
Visual cues like a smile or a furrowed brow can communicate emotions such as happiness or concern respectively. Gestures, such as a thumbs-up or a head shake, can convey agreement or disagreement but might have different meanings across cultures. The physical space between communicators or proxemics, touch or haptics, and paralinguistics, which cover the tone, pitch, and volume of voice, also play a crucial role in conveying nonverbal messages.