( ( These worms ) ( ( lack ( ( ( ( ( ( a mouth ) , ) ( digestive tract ) ) , ) and ) anus ) ) . ) )
(ROOT (S (NP (DT These) (NNS worms)) (VP (VBP lack) (NP (NP (DT a) (NN mouth)) (, ,) (NP (JJ digestive) (NN tract)) (, ,) (CC and) (NP (NNS anus)))) (. .)))
These worms lack a mouth, digestive tract, and anus.
(ROOT (S (NP (DT The) (NN term) (NN gastrointestinal) (NN tract)) (VP (VBZ describes) (NP (NP (DT the) (JJ long) (NN tube)) (SBAR (WHNP (WDT that)) (S (VP (VBZ connects) (NP (DT the) (NN mouth)) (PP (TO to) (NP (DT the) (NNS anus)))))))) (. .)))