( ( ( The ( life cycle ) ) ( of ( a hookworm ) ) ) ( ( ( ( starts and ) ends ) ( in ( the ( small intestine ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN life) (NN cycle)) (PP (IN of) (NP (DT a) (NN hookworm)))) (VP (VBZ starts) (CC and) (VBZ ends) (PP (IN in) (NP (DT the) (JJ small) (NN intestine)))) (. .)))
The life cycle of a hookworm starts and ends in the small intestine.
(ROOT (S (NP (NNS Hookworms)) (VP (VBP infest) (NP (DT the) (NNS intestines))) (. .)))