( ( ( ( Pathogens , ) ( which ( are ( ( disease-causing microorganisms ) ( such ( as ( viruses ( , ( bacteria ( , ( and protozoans ) ) ) ) ) ) ) ) ) ) ) , ) ( ( can ( ( ( ( scar and ) cause ) disease ) ( in ( ( many species ) ( of corals ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Pathogens)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (NP (NP (JJ disease-causing) (NNS microorganisms)) (PP (JJ such) (IN as) (NP (NNS viruses) (, ,) (NNS bacteria) (, ,) (CC and) (NNS protozoans))))))) (, ,)) (VP (MD can) (VP (VB scar) (CC and) (VB cause) (NP (NN disease)) (PP (IN in) (NP (NP (JJ many) (NNS species)) (PP (IN of) (NP (NNS corals))))))) (. .)))
Pathogens, which are disease-causing microorganisms such as viruses, bacteria, and protozoans, can scar and cause disease in many species of corals.
(ROOT (S (NP (NNS Trichomoniasis)) (VP (VBZ is) (VP (VB cause) (PP (IN by) (NP (DT a) (NN protozoa))))) (. .)))