Short answers, pulled from the story.
The word skeleton derives from the Greek term skeletos, meaning dried up or mummified. This etymology hints at the ancient nature of these structural frames that support animal bodies across billions of years of evolution.
Adult human skeletons contain exactly 206 bones though this number varies based on counting methods for pelvic and tail regions. Newborn babies begin life with over 270 separate bones that fuse together throughout childhood development.
Three primary types define how life maintains its shape against gravity and environmental forces: exoskeletons act as rigid outer shells, endoskeletons serve as rigid internal frames, and hydroskeletons function as flexible internal structures supported by hydrostatic pressure.
The femur represents the largest bone located in the upper leg while the stapes remains smallest within the middle ear. Male skeletons generally measure larger and heavier than female skeletons with wider breastbones and slimmer wrists observed in females.
Arthropods possess exoskeletons that encase their entire bodies like armor plates made of chitin. These creatures must undergo periodic moulting or ecdysis as they grow larger than their current shells allow.