( ( When ( we ( ( do n't ) ( know ( whether ( ( a ( disease-causing organism ) ) ( is ( ( ( ( ( ( an animal ) , ) plant ) , ) or ) fungus ) ) ) ) ) ) ) ) ( , ( we ( ( can ( ( use ( ( the tools ) ( of ( molecular biology ) ) ) ) ( to ( determine ( that ( 's ( ( organism 's ) relatives ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (PRP we)) (VP (VBP do) (RB n't) (VP (VB know) (SBAR (IN whether) (S (NP (DT a) (JJ disease-causing) (NN organism)) (VP (VBZ is) (NP (NP (DT an) (NN animal)) (, ,) (NP (NN plant)) (, ,) (CC or) (NP (NN fungus)))))))))) (, ,) (NP (PRP we)) (VP (MD can) (VP (VB use) (NP (NP (DT the) (NNS tools)) (PP (IN of) (NP (JJ molecular) (NN biology)))) (S (VP (TO to) (VP (VB determine) (SBAR (IN that) (S (VP (VBZ 's) (NP (NP (NN organism) (POS 's)) (NNS relatives)))))))))) (. .)))
When we don't know whether a disease-causing organism is an animal, plant, or fungus, we can use the tools of molecular biology to determine that's organism's relatives.
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN fungus)) (VP (VBZ causes) (NP (NP (NN ergot)) (, ,) (NP (NP (DT a) (NN disease)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBZ impacts) (NP (NNS crops)) (ADVP (RB directly))) (CC and) (VP (VBZ has) (NP (NP (ADJP (RBR more) (JJ devastating)) (NNS effects)) (PP (IN on) (NP (NNS animals))))))))))) (. .)))