16.All bones have an exterior layer, termed the cortex,that is smooth,dense,continuous,and___.

A.of varying thickness

B.varied thickness

C.its thickness varies

D.its thickness varying

8.The bonding power of any adhesive dependa on the cohesion of the adhesive itself and___to the surface to which it is applied.

A.how well does the adhesive adhere

B.how well the adhesive adheres

C.does the adhesive adhere

D.the adhesive adheres.

1.a

2.b