Booby shells
All mammals have an internal skeleton
nothing
Everything
the rats
Vertebrates are defined as having a spine and internal skeleton.
weight bearing physical activity
No, if you have an external skeleton, you don't have a backbone/vertebrae. Having vertebrae is the single qualifying factor for being a vertebrate.
By definition, arthropod skeletons are external, a defining characteristic of the phylum; having both an internal and external skeleton would be redundant.
It depends where the picture is and what type of picture.
because u would die
Probably the disc is faulty!
A grasshopper has an exoskeleton, meaning having its skeleton outside the body.