( ( This species ) ( ( lives ( in ( colonies ( on ( the ( ocean floor ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NNS species)) (VP (VBZ lives) (PP (IN in) (NP (NP (NNS colonies)) (PP (IN on) (NP (DT the) (NN ocean) (NN floor)))))) (. .)))
This species lives in colonies on the ocean floor.
(ROOT (S (NP (NP (DT The) (NN majority)) (PP (IN of) (NP (NNS species)))) (VP (VBP live) (PP (IN in) (NP (DT the) (NN ocean)))) (. .)))