Which of the Following Statements Are True of the Embryonic

Which of the following statements are true of the embryonic and infant skull (Select all that apply) ?

A) The cranial bones are first made of cartilage.
B) The first site of bone matrix production is called a center of ossification.
C) The cranial bones form sutures just before birth.
D) Bone matrix is produced by osteoclasts.
E) Fontanels are made of fibrous connective tissue,and they permit the compression of the skull during birth.
F) All the fontanels become completely ossified within 2 months after birth.