A fontanelle ________. a. is the cartilage model for a vertebra that later is converted into bone b. gives rise to the facial bones and vertebrae c. is the rod-like structure that runs the length of the early embryo d. is the area of fibrous connective tissue found at birth between the brain case bones

Trabecular bone is replaced _____.   A only after severe skeletal injuries such as complete fractures   B less frequently than cartilage is replaced   C every three to four years on average   D once during the lifetime at the beginning of puberty

The bones in the skull have many different names but what are the boundaries of each bone? Where do they start and stop? a.Boundaries for skull bones are seen only in the infant skull. b.Bones of the skull are separated by immobile joints called sutures. c.Bones of the skull are continuous but named for their specific markings. d.The boundaries are indistinct and are simply vague generalized regions.