( ( ( The organisms ) ( that ( live ( ( ( in and ) on ) ( the ( ocean floor ) ) ) ) ) ) ( ( are ( called benthos ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS organisms)) (SBAR (WHNP (WDT that)) (S (VP (VBP live) (PP (IN in) (CC and) (IN on) (NP (DT the) (NN ocean) (NN floor))))))) (VP (VBP are) (VP (VBN called) (NP (NNS benthos)))) (. .)))
The organisms that live in and on the ocean floor are called benthos .
(ROOT (S (NP (NP (VBG Living) (NNS things)) (PP (IN on) (NP (DT the) (NN ocean) (NN floor)))) (VP (VBP are) (VP (VBN known) (PP (IN as) (NP (NNS benthos))))) (. .)))
Living things on the ocean floor are known as benthos.