( ( ( A ( bivalve mollusk ) ) ( is ( ( a ( marine animal ) ) ( characterized ( by ( ( a shell ) ( divided ( into ( ( two valves ) ( hinged ( at ( ( ( ( ( ( ( ( ( ( ( ( one side ) , ) Clams ) , ) oysters ) , ) mussels ) , ) cockles ) , ) and ) scallops ) ) ) ) ) ) ) ) ) ) ) ) ( ( are ( all ( bivalve mollusks ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (JJ bivalve) (NN mollusk)) (SBAR (S (VP (VBZ is) (NP (NP (DT a) (JJ marine) (NN animal)) (VP (VBN characterized) (PP (IN by) (NP (NP (DT a) (NN shell)) (VP (VBN divided) (PP (IN into) (NP (NP (CD two) (NNS valves)) (VP (VBN hinged) (PP (IN at) (NP (NP (CD one) (NN side)) (, ,) (NP (NNP Clams)) (, ,) (NP (NNS oysters)) (, ,) (NP (NNS mussels)) (, ,) (NP (NNS cockles)) (, ,) (CC and) (NP (NNS scallops)))))))))))))))) (VP (VBP are) (ADJP (DT all) (JJ bivalve) (JJ mollusks))) (. .)))
A bivalve mollusk is a marine animal characterized by a shell divided into two valves hinged at one side, Clams, oysters, mussels, cockles, and scallops are all bivalve mollusks.
(ROOT (S (NP (DT A) (NN scallop)) (VP (VBZ is) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN mollusk))) (. .)))