( ( ( Simple animals ) ( consisting ( of ( ( ( ( a ( single ( cell layer ) ) ) , ) ( such ( as ( the ( ( ( ( ( -LRB- ( a -RRB- ) ) sponge ) , ) or ) ( only ( a ( ( few ( ( ( cell layers ) , ) ( such ( as ( the ( -LRB- ( b -RRB- ) ) ) ) ) ) ) jellyfish ) ) ) ) ) ) ) ) , ) ) ) ) ( ( ( do not ) ( have ( a ( circulatory system ) ) ) ) . ) )
(ROOT (S (NP (NP (NN Simple) (NNS animals)) (VP (VBG consisting) (PP (IN of) (NP (NP (DT a) (JJ single) (NN cell) (NN layer)) (, ,) (PP (JJ such) (IN as) (NP (DT the) (NP (PRN (-LRB- -LRB-) (X (SYM a)) (-RRB- -RRB-)) (NNS sponge)) (, ,) (CC or) (NP (RB only) (DT a) (ADJP (JJ few) (NP (NP (NN cell) (NNS layers)) (, ,) (PP (JJ such) (IN as) (NP (DT the) (PRN (-LRB- -LRB-) (X (SYM b)) (-RRB- -RRB-)))))) (NN jellyfish)))) (, ,))))) (VP (VBP do) (RB not) (VP (VB have) (NP (DT a) (JJ circulatory) (NN system)))) (. .)))
Simple animals consisting of a single cell layer, such as the (a) sponge, or only a few cell layers, such as the (b) jellyfish, do not have a circulatory system.
(ROOT (S (NP (DT A) (NN jellyfish)) (VP (VBZ does) (RB not) (VP (VB have) (NP (DT a) (JJ circulatory) (NN system)))) (. .)))