Most skull bones are formed by ossification, but other bones are formed by ossification.

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.

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides