Why is spoken communication a dynamic one?

The speaker's dialect, the speaking

rate, tone of voice and the signal to environmental noise may

change during a conversation. That sure is dynamic enough.

Also, and although it may not be

apparent to us, we never ever pronounce the same Words nor the

sameindividual sounds exactly in the same way. A good thing our

ears and our brains recognize the sound patterns or we would never

know what anybody else is talking about. Hope this helps!