( ( ( The ( primary functions ) ) ( of ( these sinuses ) ) ) ( ( are ( to ( ( ( ( ( ( warm , ) moisten ) and ) filter ) ( the air ) ) ( in ( the ( nasal cavity ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ primary) (NNS functions)) (PP (IN of) (NP (DT these) (NNS sinuses)))) (VP (VBP are) (S (VP (TO to) (VP (VB warm) (, ,) (VB moisten) (CC and) (VB filter) (NP (DT the) (NN air)) (PP (IN in) (NP (DT the) (JJ nasal) (NN cavity))))))) (. .)))
The primary functions of these sinuses are to warm, moisten and filter the air in the nasal cavity.
(ROOT (S (PP (IN In) (NP (NNS mammals))) (, ,) (NP (NN air)) (VP (VBZ is) (VP (VBN warmed) (CC and) (VBN humidified) (PP (IN in) (NP (DT the) (JJ nasal) (NN cavity))))) (. .)))