Sis forScales (fish)
A scar is a mark on your skin that shows where it has healed after it was damaged. Scar tissue can also form inside you if you have an internal injury. The man in the picture has a scar from donating a kidney.
Video: view
Skulls are a bony structure that is found inside your head, and in the head of almost all animals. The top part of the skull is called the cranium and the bottom part is called the mandible. Your mandible is more commonly called your jaw, and is the part that moves up and down as you chew or open and close your mouth.
The picture is of a fox's cranium.