( organ ( ( ( ( ( A structure ) ( composed ( of ( different tissues ) ) ) ) , ) ( ( such ( as ( ( root ( , ( stem ( , ( leaf ( , ( or reproductive ) ) ) ) ) ) ) ( -LRB- ( ( ( e.g. , ) flower ) -RRB- ) ) ) ) ) parts ) ) . ) )
(ROOT (S (NP (NN organ)) (VP (NP (NP (DT A) (NN structure)) (VP (VBN composed) (PP (IN of) (NP (JJ different) (NNS tissues))))) (, ,) (NP (ADJP (JJ such) (PP (IN as) (NP (NP (NN root) (, ,) (NN stem) (, ,) (NN leaf) (, ,) (CC or) (NN reproductive)) (PRN (-LRB- -LRB-) (NP (NNP e.g.)) (, ,) (NP (NN flower)) (-RRB- -RRB-))))) (NNS parts))) (. .)))
organ A structure composed of different tissues, such as root, stem, leaf, or reproductive (e.g., flower) parts.
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN organ)) (VP (VBZ is) (NP (NP (DT a) (NN structure)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (NP (QP (CD one) (CC or) (JJR more)) (NNS types)) (PP (IN of) (NP (NNS tissues))))))))))) (. .)))
A(n) organ is a structure that is composed of one or more types of tissues.