( ( Though ( termites ( consume wood ) ) ) ( , ( they ( ( are ( unable ( to ( ( ( ( digest it ) ( but instead ) ) ( ( possess ( one-celled protozoa ) ) ( in ( ( their gut ) ( that ( ( ( breaks down ) ( the ( wood cellulose ) ) ) ( into ( a form ) ) ) ) ) ) ) ) ( that ( ( the termite ) ( ( can then ) consume ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Though) (S (NP (NNS termites)) (VP (VBP consume) (NP (NN wood))))) (, ,) (NP (PRP they)) (VP (VBP are) (ADJP (JJ unable) (S (VP (TO to) (VP (VP (VB digest) (NP (PRP it))) (CONJP (CC but) (RB instead)) (VP (VB possess) (NP (JJ one-celled) (NN protozoa)) (PP (IN in) (NP (NP (PRP$ their) (NN gut)) (SBAR (WHNP (WDT that)) (S (VP (VBZ breaks) (PRT (RP down)) (NP (DT the) (NN wood) (NN cellulose)) (PP (IN into) (NP (DT a) (NN form))))))))) (SBAR (IN that) (S (NP (DT the) (NN termite)) (VP (MD can) (RB then) (VP (VB consume)))))))))) (. .)))
Though termites consume wood, they are unable to digest it but instead possess one-celled protozoa in their gut that breaks down the wood cellulose into a form that the termite can then consume.
(ROOT (S (NP (JJ Certain) (JJ anaerobic) (JJ parabasalid) (NNS species)) (VP (VBP exist) (PP (IN in) (NP (NP (DT the) (JJ digestive) (NNS tracts)) (PP (IN of) (NP (NP (NNS termites)) (CC and) (NP (JJ wood-eating) (NNS cockroaches)))))) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (PRP they)) (VP (VBP contribute) (NP (NP (DT an) (JJ essential) (NN step)) (PP (IN in) (NP (NP (DT the) (NN digestion)) (PP (IN of) (NP (NN cellulose)))))))))) (. .)))