A main function of the skeletal system is to

a. protect internal organs.
b. allow your body to move.
c. store and produce materials.
d. all of the above*

d. all of the above

b. joint.

The condition related to weak and hole-filled spongy bone in elderly individuals is osteoporosis.

A place where two bones come together is known as a(n)

a. ligament.
b. joint.
c. cartilage.
d. ossification

elderly individuals are more likely to break a bone when they fall because many of their bones have become weak due to holes in the spongy bone, which is related to what condition?