Which part of the face does the mandible form?

The mandible, commonly known as the lower jaw, is the only movable bone of the skull and plays a crucial role in the structure of the face. It forms the lower part of the face, providing support for the lower teeth and allowing for movements necessary for chewing and speaking. This significance in both functionality and anatomy makes it the correct answer.

In contrast, the upper jaw, also known as the maxilla, is a separate bone that forms the upper part of the jaw structure, providing different functions and support for the upper teeth. The cheekbone area is formed by the zygomatic bones, which are distinct from the mandible and contribute to the prominence of the cheeks. The forehead, on the other hand, is formed by the frontal bone, which is located at the front of the skull and unrelated to the jaw structure. Understanding these differences helps clarify why the mandible specifically relates to the lower jaw.