Subject	marine mammal
Predicate	has_property
Object	keystone species
Modality	Modality Occurrences often 1 TBC[often keystone species] 1
Polarity	POSITIVE
Plausibility	0.0018
Neighborhood Sigma	0.0018
Local Sigma	0.0020
Example Sentences	Sentence Occurrences Source marine mammals are often keystone species 2 Google Autocomplete