( ( ( ( ( The first ) , ) ( called ( a ( heterogeneous mixture ) ) ) ) , ) ( ( ( is ( distinguished ( by ( the fact ) ) ) ) ( that ( ( ( different samples ) ( of ( the mixture ) ) ) ( may ( have ( a ( different composition ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ first)) (, ,) (VP (VBN called) (NP (DT a) (JJ heterogeneous) (NN mixture))) (, ,)) (VP (VBZ is) (ADJP (JJ distinguished) (PP (IN by) (NP (DT the) (NN fact)))) (SBAR (IN that) (S (NP (NP (JJ different) (NNS samples)) (PP (IN of) (NP (DT the) (NN mixture)))) (VP (MD may) (VP (VB have) (NP (DT a) (JJ different) (NN composition))))))) (. .)))
The first, called a heterogeneous mixture, is distinguished by the fact that different samples of the mixture may have a different composition.
(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)))))))))) (. .)))