( ( ( Detritivores and ) decomposers ) ( are ( responsible ( for ( ( ( consuming ( dead ( organic material ) ) ) and ) ( ( returning ( small molecules ) ) ( to ( the ( ( air and ) soil ) ) ) ) ) ) ) ) )
(ROOT (S (NP (NNS Detritivores) (CC and) (NNS decomposers)) (VP (VBP are) (ADJP (JJ responsible) (PP (IN for) (S (VP (VP (VBG consuming) (NP (JJ dead) (JJ organic) (NN material))) (CC and) (VP (VBG returning) (NP (JJ small) (NNS molecules)) (PP (TO to) (NP (DT the) (NN air) (CC and) (NN soil)))))))))))
Detritivores and  decomposers  are responsible for consuming dead organic material and returning  small  molecules to the air and soil
(ROOT (S (NP (NNS Detritivores)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (NNS decomposers)) (SBAR (WHNP (WDT that)) (S (VP (VBP consume) (NP (NP (JJ dead) (NNS leaves)) (, ,) (NP (NN animal) (NNS feces)) (, ,) (CC and) (NP (NP (JJ other) (JJ organic) (NN debris)) (VP (VBN collected) (PP (PP (IN on) (NP (DT the) (NN ground))) (CC or) (PP (IN at) (NP (NP (DT the) (NN bottom)) (PP (IN of) (NP (NN water)))))))))))))))) (. .)))