Which unique identifier is assigned to third-party payers and has 10 numeric positions, including a check digit as the tenth position?

When a tooth has a solid red line going through the roots, this could generally mean what about the tooth?

It is in need of endodontic treatment. It is unerupted. It is a full gold crown. It is impacted.

A muscle that suddenly and violently contracts is said to have a(n):

A. ataxia. B. atrophy. C. spasm. D. hernia.