( Hookworms ( ( are ( ( small ( intestine parasites ) ) ( that ( ( ( bite ( the ( intestinal lining ) ) ) and ) ( ( feed aggressively ) ( on blood ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Hookworms)) (VP (VBP are) (NP (NP (JJ small) (NN intestine) (NNS parasites)) (SBAR (WHNP (WDT that)) (S (VP (VP (VB bite) (NP (DT the) (JJ intestinal) (NN lining))) (CC and) (VP (VB feed) (ADVP (RB aggressively)) (PP (IN on) (NP (NN blood))))))))) (. .)))
Hookworms are small intestine parasites that bite the intestinal lining and feed aggressively on blood.
(ROOT (S (NP (NNS Hookworms)) (VP (VBP infest) (NP (DT the) (NNS intestines))) (. .)))