( ( ( The ( long ears ) ) ( of rabbits ) ) ( ( are ( ( ( most likely ) ( an adaptation ) ) ( for ( detecting predators ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ long) (NNS ears)) (PP (IN of) (NP (NNS rabbits)))) (VP (VBP are) (NP (NP (ADJP (RBS most) (JJ likely)) (DT an) (NN adaptation)) (PP (IN for) (S (VP (VBG detecting) (NP (NNS predators))))))) (. .)))
The long ears of rabbits are most likely an adaptation for detecting predators.
(ROOT (S (NP (DT A) (JJR fewer) (NNS predators)) (VP (VBZ is) (ADJP (RBS most) (JJ likely) (S (VP (TO to) (VP (VB cause) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS rabbits)) (VP (VBG living) (PP (IN in) (NP (DT an) (NN area))) (S (VP (TO to) (VP (VB increase))))))))))))) (. .)))
A fewer predators is most likely to cause the number of rabbits living in an area to increase.