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Bone
Bone marrow.
The bone marrow. As you look inside of a bone you will see a core of softer material. That material is bone marrow.
bone marrow
Bone is a composite material, like fiberglass (something hard [and thus brittle] in a matrix of a more flexible substance. In fiberglass the glass makes the (fishing rod) strong, the plastic makes it tough. In bone, the calcium salts make it strong and hard, the connective tissue makes it tough.
Minerals like calcium and phosphorus :)
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.
Marrow. It makes blood cells.
calcium
Bone marrow
bone marrow
MARROW, bone marrow makes blood cells.