Which of these is/are true about bone structure?
1. Bone matrix contains proteins like collagen that provide flexibility
2. Bone contains both organic and inorganic components
3. In most bones, the epiphyses are wider than the diaphysis, and they are places for muscle attachment
4. Most of the inorganic mineral in bone matrix is calcium carbonate
a) 1 & 3
b) 2 & 4
c) 1, 2 & 3
d) 4 only
e) all of the above