Question

1. the word parts litho-, petro- and lapio- all mean: milk liver twisted stone 14) periodontitis, riggs disease, and periodontoclasia all refer to: gingivitis tartar scurvy pyorrhea

Explanation:

The word - parts "Litho -", "Petro -", and "Lapio -" are Greek and Latin roots commonly used in scientific and medical terminologies to denote stone. Periodontitis, Rigg's disease, and periodontoclasia are all names for pyorrhea, a severe gum disease characterized by the discharge of pus from the gums.

Answer:

1. Stone
2. pyorrhea