( ( One ( of ( the ( simplest ( essential parts ) ) ) ) ) ( , ( ( more commonly ) ( ( called ( ( cells , ) ( ( of which ) ( ( ( ( ( ( animal ( and ( vegetable organisms ) ) ) , ) or ) ( their ( ( tissues and ) organs ) ) ) , ) ( are composed ) ) ) ) ) . ) ) ) )
(ROOT (S (NP (NP (CD One)) (PP (IN of) (NP (DT the) (JJS simplest) (JJ essential) (NNS parts)))) (, ,) (ADVP (RBR more) (RB commonly)) (VP (VBD called) (NP (NP (NNS cells)) (, ,) (SBAR (WHPP (IN of) (WHNP (WDT which))) (S (NP (NP (NN animal) (CC and) (NN vegetable) (NNS organisms)) (, ,) (CC or) (NP (PRP$ their) (NNS tissues) (CC and) (NNS organs)) (, ,)) (VP (VBP are) (VP (VBN composed))))))) (. .)))
One of the simplest essential parts, more commonly called cells , of which animal and vegetable organisms, or their tissues and organs, are composed.
(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.