( ( Healthy ( , ( robust people ) ) ) ( rarely ( ( get ( ( infections Micro-organisms ) ( ( play ( an ( essential role ) ) ) ( in ( decomposing ( ( ( dead plants ) & ) animals ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (JJ Healthy) (, ,) (JJ robust) (NNS people)) (ADVP (RB rarely)) (VP (VBP get) (S (NP (NNP infections) (NNP Micro-organisms)) (VP (VB play) (NP (DT an) (JJ essential) (NN role)) (PP (IN in) (S (VP (VBG decomposing) (NP (NP (JJ dead) (NNS plants)) (CC &) (NP (NNS animals))))))))) (. .)))
Healthy, robust people rarely get infections Micro-organisms play an essential role in decomposing dead plants &amp; animals.
(ROOT (S (NP (NNS Mushrooms)) (VP (VBP get) (NP (PRP$ their) (NN energy)) (PP (IN from) (S (VP (VBG decomposing) (NP (JJ dead) (NNS organisms)))))) (. .)))
Mushrooms get their energy from decomposing dead organisms.