Answer:
Step-by-step explanation
When people were not aware of the verbal way of communication due to knowledge barrier or language barrier, they mostly used their body gestures and sounds to communicate.
For example, When they have to tell their people that the wild animals were approaching to attack they made sounds of high intensity.
Also when they have to share their feelings they use their senses like eyes, signs, and touch sense.
Personally while visiting Germany had no knowledge of the German language but somehow with my body gesture managed to communicate and the task was done.