Incremental lines of Retzius appear_____________?

Enamel 05/12/2020

A. As lines in the enamel running at right angles to the enamel surface
B. As lines in the dentin running at right angles to the dentino-enamel junction
C. In enamel and follow the apposition pattern
D. In dentin and follow the appositional pattern

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    Dark bonds that are present in enamel rods at intervals of 4 μms are______________?
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