( Cactus ( ( spines ( ( keep ( the plant ) ) ( from ( being ( eaten ( by ( most animals ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Cactus)) (VP (VBZ spines) (VP (VB keep) (NP (DT the) (NN plant)) (PP (IN from) (S (VP (VBG being) (VP (VBN eaten) (PP (IN by) (NP (JJS most) (NNS animals))))))))) (. .)))
Cactus              spines keep the plant from being eaten by most animals.
(ROOT (S (NP (NP (DT The) (NNS spines)) (PP (IN of) (NP (DT a) (NN cactus)))) (VP (VBP help) (SBAR (S (NP (PRP it)) (VP (VBP survive) (SBAR (IN because) (S (NP (NNS spines)) (VP (VB protect) (NP (DT the) (NN cactus)) (PP (IN from) (NP (NNS animals)))))))))) (. .)))