What makes bones ductile and strong? Let's go in order👇🏻 Organic substances (the main one is ossein) and fibers are responsible for bone elasticity and flexibility. Children feature a higher proportion of organic substances in their bones than adults, so they are more flexible. But for hardness are responsible inorganic substances - mainly salts of calcium, phosphorus and magnesium. The very structure of the bone plates is also responsible for density. Naturally, both of these characteristics work in tandem, due to which bones become the perfect "foundation" of our body🦴