What is a surfactant?

a. A chemical catalyst
b. An inhibitor in chemical chain reactions
c. The fourth leg of the fire tetrahedron
d. A compound capable of increasing the wetting and penetrating ability of water

D

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Any curvature either toward or away from the contact area is a/an:

A. embrasure B. periodontal curve C. occlusal arch D. interproximal space

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On the figure of the female reproductive system, identify number 3: _______________ _______________. 

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