( ( ( ( There ( is ( ( an ( ( ( unseen but ) fascinating ) universe ) ) ( of ( microbes ( living ( within ( the soil ) ) ) ) ) ) ) ) and ) ( they ( are ( ( the ( key means ) ) ( ( by which ) ( ( nutrients ( such ( as ( ( carbon and ) nitrogen ) ) ) ) ( are ( cycled ( through ( the ( soil system ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (EX There)) (VP (VBZ is) (NP (NP (DT an) (ADJP (JJ unseen) (CC but) (JJ fascinating)) (NN universe)) (PP (IN of) (NP (NP (NNS microbes)) (VP (VBG living) (PP (IN within) (NP (DT the) (NN soil))))))))) (CC and) (S (NP (PRP they)) (VP (VBP are) (NP (NP (DT the) (JJ key) (NN means)) (SBAR (WHPP (IN by) (WHNP (WDT which))) (S (NP (NP (NNS nutrients)) (PP (JJ such) (IN as) (NP (NN carbon) (CC and) (NN nitrogen)))) (VP (VBP are) (VP (VBN cycled) (PP (IN through) (NP (DT the) (NN soil) (NN system)))))))))) (. .)))
There is an unseen but fascinating universe of microbes living within the soil and they are the key means by which nutrients such as carbon and nitrogen are cycled through the soil system.
(ROOT (S (NP (DT The) (NN nitrogen) (NN cycle)) (VP (VBZ includes) (NP (NP (NN air)) (, ,) (NP (NN soil)) (, ,) (CC and) (NP (VBG living) (NNS things)))) (. .)))