Assertion: porpoise's feature | /r/HasProperty | the composition of the teeth
Facets:
Source sentences:
text: Another similar feature was the composition of the teeth, which contained mostly calcium phosphate which is needed for eating and drinking by aquatic animals, though, unlike modern day toothed whales, they had a heterodont (more than one tooth morphology) dentition as opposed to a homodont (one tooth morphology present) dentition.