Relating to an endoskeleton, the internal bony or cartilaginous framework that supports the body from within, as found in vertebrates.
From Greek 'endo-' (inside) + 'skeletos' (dried body/skeleton) + '-al' (relating to). The term describes internal skeletal systems, contrasting with exoskeletons of insects.
Your endoskeletal bones are living, growing tissues that constantly rebuild themselves—your skeleton is completely replaced about every 10 years, but insects with exoskeletons have to shed and regrow their entire rigid outer shell, making growth incredibly dangerous and slow.
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