( This ( ( is ( ( ( ( ( parasitism ( because ( ( an organism ) ( is benefiting ) ) ) ) , ) ( ( ( the tick ) , ) ( while ( ( the ( other one ) ) ( is ( being harmed ) ) ) ) ) ) , ) ( in ( ( this case ) ( the tortoise ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (NP (NP (NP (NN parasitism)) (SBAR (IN because) (S (NP (DT an) (NN organism)) (VP (VBZ is) (VP (VBG benefiting)))))) (, ,) (NP (NP (DT the) (NN tick)) (, ,) (SBAR (IN while) (S (NP (DT the) (JJ other) (NN one)) (VP (VBZ is) (VP (VBG being) (VP (VBN harmed))))))) (, ,) (PP (IN in) (NP (NP (DT this) (NN case)) (NP (DT the) (NN tortoise)))))) (. .)))
This is parasitism because an organism is benefiting, the tick, while the other one is being harmed, in this case the tortoise.
(ROOT (S (S (NP (NNP Parasitism)) (VP (VBP isl) (NP (NP (DT a) (NN relationship)) (SBAR (WHADVP (WRB where)) (S (NP (DT the) (NNS bacteria)) (VP (VBP benefit))))))) (CC and) (S (CC and) (NP (DT the) (JJ other) (NN organism)) (VP (VBZ is) (ADJP (VBN harmed)))) (. .)))