( ( ( mathematics , ) ( ( ( chemistry , ) and ) ( the ( physical sciences ) ) ) ) . )
(ROOT (NP (NP (NNS mathematics)) (, ,) (NP (NP (NN chemistry)) (, ,) (CC and) (NP (DT the) (JJ physical) (NNS sciences))) (. .)))
mathematics, chemistry, and the physical sciences.
(ROOT (S (NP (NP (NNP Chemistry)) (CC and) (NP (NNS physics))) (VP (VBP are) (NP (NP (NNS fields)) (PP (IN in) (NP (JJ physical))))) (. .)))