Assertion: frontal sinus | /r/HasProperty | last
Facets:
value: with being complete
type: OTHER
value: to develop most variable
type: PURPOSE
Source sentences:
text: The frontal sinuses are last to develop and are most variable.
text: The frontal sinuses are the last to appear, around 7-8 years of age, with the pneumatization being complete only after the individual reaches late adolescence .