Assertion: lung | /r/MadeOf | sac
Facets:
Source sentences:
text: Gills are made up of rows of filaments through which water continuously flows while lungs contain sacs connected to the outside through a network of breathing tubes.
text: The lungs are the primary organ and contain numerous sacs known as alveoli, where gas exchange occurs.
text: Gills are made up of rows of filaments through which water continuously flows while lungs contain sacs connected to the outside through a network of breathing tubes.