Subject	keystone species
Predicate	positively contribute to
Object	biodiversity
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.7117
Neighborhood Sigma	0.7440
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source a keystone species positively contribute to biodiversity in an ecosystem 4 Google Autocomplete