The loss of breeding habitat, the introduction of bullfrogs outside their historic range (bullfrogs will eat other frogs), chronic amphibian diseases and excessive use of insecticides have also caused some amphibian populations to decline.
(bullfrogs; will eat; other frogs) (chronic amphibian diseases and excessive use of insecticides; have caused; some amphibian populations to decline) Context(chronic amphibian diseases and excessive use of insecticides have caused,List([123, 200))):(some amphibian populations; to decline; )
chronic amphibian diseases and excessive use of insecticides have caused,List([123, 200))
bullfrogs chronic amphibian diseases and excessive use of insecticides some amphibian populations
will eat have caused to decline
other frogs
some amphibian populations to decline