Answer :

Final answer:

The facial ridge of the facial cusp of the first maxillary premolar descends onto the facial surface.

Explanation:

In primates, premolars can be differentiated from molars by the number of cusps they have. Premolars are smaller and often have one or two cusps, while molars are larger with more cusps. For the first maxillary premolar, the facial ridge of the facial cusp descends onto the facial surface. This means that there is a ridge on the front-facing side of the premolar's cusp that extends down onto the surface of the tooth.

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