Joints may be defined as the area where two bone meet together. The movable joints allows the movement of the bones. Immovable joints limits the movement of the particular bones of the body.
Synarthrosis joints are fibrous joints that limit the body movement. This joint is connected by cartilage on the epiphyseal plate. Synarthrosis joint is present between the first rib and manubrium prior to the adulthood. Amphiarthrosis is a slightly movable joint. The contiguous bony surface of amphiarthrosis joint is pubic symphysis.
Thus, the correct answer is option (4).
the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.
a physical change is being made.