( ( The ( term benthos ) ) ( ( refers ( to ( organisms ( that ( live ( ( ( on or ) in ) ( the ( sea bottom ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN term) (NNS benthos)) (VP (VBZ refers) (PP (TO to) (NP (NP (NNS organisms)) (SBAR (WHNP (WDT that)) (S (VP (VBP live) (PP (IN on) (CC or) (IN in) (NP (DT the) (NN sea) (NN bottom))))))))) (. .)))
The term benthos refers to organisms that live on or in the sea bottom.
(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.