( They ( ( ( ( ( ( reproduce sexually ) ( in ( ( the gut ) ( of ( the mosquito ) ) ) ) ) , ) and ) ( ( work ( their way ) ) ( to ( the ( salivary glands ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VP (VB reproduce) (ADVP (RB sexually)) (PP (IN in) (NP (NP (DT the) (NN gut)) (PP (IN of) (NP (DT the) (NN mosquito)))))) (, ,) (CC and) (VP (VB work) (NP (PRP$ their) (NN way)) (PP (TO to) (NP (DT the) (JJ salivary) (NNS glands))))) (. .)))
They reproduce sexually in the gut of the mosquito, and work their way to the salivary glands.
(ROOT (S (NP (NNS Vertebrates)) (VP (VB reproduce) (ADVP (RB sexually))) (. .)))