The individual parts of any structure need to be selected ... fence or something much more complex such as a skyscraper. A shell structure has a thin curved outer layer and is hollow.

That structure actually helps turtles breathe ... Narrator: A turtle's shell is as much a part of its body as our rib cage is of ours. In fact, it is their rib cage, and their spine, and their ...

which part of the shell is fractured; which surrounding structures may be damaged; whether parts of the shell are missing or 'non-vital'; presence of pre-existing shell disease; presence of other ...