OK this is going to be a crazy post, just hold your horses cartelige is a permeable material for various occupants, oxigen being one. So we find that highly o

OK this is going to be a crazy post, just hold your horses cartelige is a permeable material for various occupants, oxigen being one. So we find that highly oxigenated creatures are larger and more carnivorous we also know that high ingestion of oxygen results in larger creatures so if a shark has a larger ability to permeate oxygen into the muscles and have the ability to store heat, plus the ability to transfer heat/oxy btwn bodies... This is why we can see a body +500 years old.. buoyed by the buoyancy of less dense bones, such as cartilage.