( ( ( Role ( of ( ( ( ( planktonic organisms ) , ) ( especially protozoa ) ) , ) ) ) ( in ( biogeochemical cycles ) ) ) . )
(ROOT (NP (NP (NNP Role)) (PP (IN of) (NP (NP (JJ planktonic) (NNS organisms)) (, ,) (NP (RB especially) (NN protozoa)) (, ,))) (PP (IN in) (NP (JJ biogeochemical) (NNS cycles))) (. .)))
Role of planktonic organisms, especially protozoa, in biogeochemical cycles.
(ROOT (S (NP (PRP We)) (VP (VBP call) (NP (NP (DT the) (NN recycling)) (PP (IN of) (NP (NP (JJ inorganic) (NN matter)) (PP (IN between) (NP (NP (VBG living) (NNS organisms)) (CC and) (NP (PRP$ their) (NN environment) (NN biogeochemical) (NN cycle)))))))) (. .)))