In endochondral ossification,what is the original source of osteoblasts?

What statements describe bone remodeling.
1.It occurs throughout your lifetime.
2.It involves bone resorption.
3.It involves bone deposition.
4.It occurs at different rates at different locations.
5.It occurs at a faster rate in compact bone than spongy bone.
6.Osteoclasts and osteoblasts will be working on the same tunnel simultaneously.
7.Osteoclasts place calcium and phosphorus directly into the bloodstream.

The _______ is the region of long bone that contains hyaline cartilage used for growth in length.