( ( Several tissues ) ( ( ( make up ) ( a ( plant system ) ) ) . ) )
(ROOT (S (NP (JJ Several) (NNS tissues)) (VP (VBP make) (PRT (RP up)) (NP (DT a) (NN plant) (NN system))) (. .)))
Several tissues make up a plant system.
(ROOT (S (NP (NN Ground) (NN tissue)) (VP (VBZ makes) (PRT (RP up)) (NP (NP (JJS most)) (PP (IN of) (NP (NP (DT the) (NN inside)) (PP (IN of) (NP (DT a) (NN plant))))))) (. .)))