Final answer:
The lateral movement of the cheeks is used to evacuate smaller volumes of fluid from the oral cavity.
Step-by-step explanation:
The lateral movement of the cheeks is used to evacuate smaller volumes of fluid from the oral cavity.
For example, when you suck on a straw, the movement of your cheeks helps draw the fluid into your mouth and then evacuate it.
Similarly, this lateral movement of the cheeks is also used to compress air in the mouth while blowing, allowing you to exhale forcefully.