( ( ( Heterogeneous and ) homogeneous ) mixtures )
(ROOT (NP (NP (NNS Heterogeneous) (CC and) (NNS homogeneous)) (NP (NNS mixtures))))
Heterogeneous and  homogeneous mixtures
(ROOT (S (NP (NNS Heterogeneous)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (DT a) (NN mixture)) (SBAR (WHNP (WDT that)) (S (VP (VBZ varies) (PP (IN in) (NP (PRP$ its) (NN composition)))))))))) (. .)))