A. In cross sections enamel rods appear hexagonal and resembles fish scales
B. The bodies of rods are near occlusal and incisal surfaces, where as the tails point cervically
C. The apatite crystals are parallel to bodies and deviate 65° from the tails
D. All of the above

A. Greater than the thickness of enamel
B. Less than the thickness of enamel
C. Equal to the thickness of enimal
D. None of the above

A. 2.8
B. 3.8
C. 4.8
D. 2.3

A. Tono filament
B. Keratin like fibre
C. Collagen fibre
D. Vimentin filament