( ( ( ( The troposphere ) , ) ( ( ( ( the stratosphere ) , ) and ) ( the ionosphere ) ) ) . )
(ROOT (NP (NP (DT The) (NNP troposphere)) (, ,) (NP (NP (DT the) (NN stratosphere)) (, ,) (CC and) (NP (DT the) (NN ionosphere))) (. .)))
The troposphere, the stratosphere, and the ionosphere.
(ROOT (S (NP (DT The) (NN stratosphere)) (VP (VBZ is) (NP (NP (DT the) (NN layer)) (PP (IN above) (NP (DT the) (NNP troposphere))))) (. .)))