( ( An ORGAN ) ( ( is ( ( a ( discrete structure ) ) ( that ( ( ( performs ( specific functions ) ) and ) ( is ( composed ( of ( ( ( at least ) 2 ) ( tissue types ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (NN ORGAN)) (VP (VBZ is) (NP (NP (DT a) (JJ discrete) (NN structure)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBZ performs) (NP (JJ specific) (NNS functions))) (CC and) (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (QP (IN at) (JJS least) (CD 2)) (NN tissue) (NNS types)))))))))) (. .)))
An ORGAN is a discrete structure that performs specific functions and is composed of at least 2 tissue types.
(ROOT (S (NP (NNS Roundworms)) (VP (VBP exemplify) (NP (NP (JJ organ-level) (NN organization)) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (NP (QP (CD two) (CC or) (JJR more)) (NNS types)) (PP (IN of) (NP (NNS tissues)))) (VP (VBP work) (ADVP (RB together)) (S (VP (TO to) (VP (VB perform) (NP (DT a) (JJ particular) (NN function)) (PP (IN as) (NP (DT an) (NN organ))))))))))) (. .)))