( ( In ( ( most areas ) ( with ( predators ( and ( beaver trapping ) ) ) ) ) ) ( , ( they ( ( live ( 10 ( years ( or less ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NP (JJS most) (NNS areas)) (PP (IN with) (NP (NNS predators) (CC and) (NN beaver) (NN trapping))))) (, ,) (NP (PRP they)) (VP (VBP live) (NP (CD 10) (NNS years) (QP (CC or) (JJR less)))) (. .)))
In most areas with predators and beaver trapping, they live 10 years or less.
(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.