( ( ( ( ( ( Stony corals ) ( are ( similar ( to ( sea anemones ) ) ) ) ) , ) but ) ( ( coral polyps ) ( are ( smaller ( -LRB- approx ) ) ) ) ) . )
(ROOT (S (S (NP (JJ Stony) (NNS corals)) (VP (VBP are) (ADJP (JJ similar) (PP (TO to) (NP (NN sea) (NNS anemones)))))) (, ,) (CC but) (S (NP (NN coral) (NNS polyps)) (VP (VBP are) (NP (JJR smaller) (NN -LRB-) (NN approx)))) (. .)))
Stony corals are similar to sea anemones, but coral polyps are smaller (approx.
(ROOT (S (NP (NNS Hydras) (CC and) (NN sea) (NNS anemones)) (VP (VBP are) (NP (NP (NNS examples)) (PP (IN of) (NP (NN apolyp))))) (. .)))