Assertion: american alligator | /r/HasProperty | a keystonespecies
Facets:
value: by many
type: OTHER
Source sentences:
text: American alligators have proven to be an important part of the environment, and therefor, are considered by many to be a "keystone" species.
text: American alligators are an important part of the environment and are therefore considered by many to be a “keystone” species.