When does osteogenesis occur in an embryo?

During development, the circulatory system of the chick embryo translocates about 120 mg of calcium from the shell to the skeleton . When chick embryos are removed from their shells at day 3 and grown in shell-less cultures (in plastic wrap) for the duration of their development, much of the cartilaginous skeleton fails to mature into bony tissue

the trait of personality falls in the middle of the diagram because personality is a mixture of ones nature and environment.