( Mold ( ( ( can only ) ( grow ( if ( it ( has ( ( an ( organic ( food source ) ) ) ( like ( wood ( , ( paper ( , ( sheet ( ( rock or ) cellulose ) ) ) ) ) ) ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (NNP Mold)) (VP (MD can) (ADVP (RB only)) (VP (VB grow) (SBAR (IN if) (S (NP (PRP it)) (VP (VBZ has) (NP (NP (DT an) (JJ organic) (NN food) (NN source)) (PP (IN like) (NP (NN wood) (, ,) (NN paper) (, ,) (NN sheet) (NN rock) (CC or) (NN cellulose))))))))) (: ;)))
Mold can only grow if it has an organic food source like wood, paper, sheet rock or cellulose;
(ROOT (S (NP (DT A) (NN mold)) (VP (VBZ is) (NP (NP (DT an) (NN imprint)) (PP (IN of) (NP (NP (DT an) (NN organism)) (VP (VBN left) (PP (IN in) (NP (NN rock)))))))) (. .)))