The strength and rigidity of the bone is a result of the inorganic salts deposited in the matrix. Matrix is basically just large amount of non-cellular materials, which is what your bones are made of.
lololollolololo
calcium
What extra bones ?
There is no extra bone. You remove 6 bones from the three sets of bones to make the letters T-E-N in bones. Remove three, leaving two to make the T. Remove one, leaving four to make the E. Remove two, leaving three to make the N.
Calcium
Most bird bones are very light, because extra weight would make it impossible to fly.
soft you can bend and hard you can not
Seal's bones are hard.
Mineral salts from calcium and phosphorus compounds are essential for making bones hard and strong. calcium is the most essential mineral to make bones strong but not all bones are as hard as you think some bones are "Spongy" but we just dont notice it. hope this helps if you need to know this....
Calcium and phosphorus are the two elements that help make bones hard. These minerals combine to form hydroxyapatite crystals, which give bones their strength and rigidity.
To make your knuckles hard, you should consider doing things that strengthen your bones. There's no other way to get hard knuckles in your hands, however.
Extra bones are not too dangerous. I myself have 3 extra bones on my legs. One of these is on the back of my leg ... i had this remove as it was giving me bother walking. the other two are on the inside of my knees. Extra bones are caused at the growth plates on your main bones, i.e the Femur or likewise. To answer your question they can sometimes cause more wear and tear but are generally smooth, mines was causing the muscle to cramp round it hence why i got it removed. if you are worried make an appointment with your GP to get it checked. hope that this helps