( ( The ( nasal cavity ) ) ( ( ( ( ( ( warms and ) moistens ) ( the air ) ) and ) ( ( filters it ) ( of impurities ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ nasal) (NN cavity)) (VP (VP (VBZ warms) (CC and) (VBZ moistens) (NP (DT the) (NN air))) (CC and) (VP (VBZ filters) (NP (PRP it)) (PP (IN of) (NP (NNS impurities))))) (. .)))
The nasal cavity warms and moistens the air and filters it of impurities.
(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))))) (. .)))