Correctly order the following key steps in the process of endochondral ossification. 1. Chondrocytes die. 2. Osteoblasts build the bone collar on the external surface of the bone. 3. Perichondrium is invaded by blood vessels. 4. In the primary ossification center, osteoblasts replace calcified cartilage with early spongy bone. 5. Perichondrial cells differentiate into osteogenic cells then into osteoblasts.

Endochondral ossification

Explanation:

The Correct order is 3,5,2,1,4Endochondral ossification includes the supplanting of hyaline ligament with hard tissue. A large portion of the bones of the skeleton are shaped right now. These bones are called endochondral bones. The  future bones are first shaped as hyaline ligament models.   Endochondral solidification is additionally a basic procedure during the simple arrangement of long bones, the development of the length of long bones, and the characteristic mending of bone fractures.