If the singular term ends in -us, the plural is usually formed by changing the ending to

The purity of ecstasy is always in question, why? (short answer)

Amedical coder billing for a hospital inpatient stay would use a/ancms-1500 claim form. b. ub-98 claim form. c. cms-1250 claim form. d. ub-04 claim form.

The nature–nurture issue refers to the debate over the relative contributions that make to the development of psychological traits. a.introspection and nerve cell activity b.unconscious and conscious motives c.behavior and mental processes d.genes and experience