Answer:
Intramembranous, Endochondral
Explanation:
Fibrous membrane and hyaline cartilage are usually present at the beginning of all bone skeletons in an embryo of six (6)weeks. The difference is that intramembranous ossification develops from the fibrous membrane while that of endochondral from the hyaline cartilage. Ossification is driven by osteoblasts which are the main cell of bones.
