Answer:
collagen fibers
Step-by-step explanation:
"Collagen fibers" function as supporting structures. They ensure that the minerals in bones are kept in place. It is hard and insoluble; it also provides "tensile strength." It makes the bones hard and resist fractures as much as possible. This is also largely dependent on the orientation of the collagen fibers. A bone that lacks in collagen has a higher tendency to break because it is brittle.