( ( ( 22.2 ( MOLLUSKS ( Phylum Mollusca ) ) ) ( ( ( ( A description ) ( of ( the ( body structure ) ) ) ) and ) ( ( ( ( ( ecological role ) ( of mollusks ) ) , ) plus ) ( descriptions ( of ( the ( seven ( mollusk classes ) ) ) ) ) ) ) ) . )
(ROOT (NP (NP (NNP 22.2) (NNP MOLLUSKS) (NNP Phylum) (NNP Mollusca)) (NP (NP (NP (DT A) (NN description)) (PP (IN of) (NP (DT the) (NN body) (NN structure)))) (CC and) (NP (NP (NP (JJ ecological) (NN role)) (PP (IN of) (NP (NNS mollusks)))) (, ,) (CC plus) (NP (NP (NNS descriptions)) (PP (IN of) (NP (DT the) (CD seven) (NN mollusk) (NNS classes)))))) (. .)))
22.2 MOLLUSKS Phylum Mollusca A description of the body structure and ecological role of mollusks, plus descriptions of the seven mollusk classes.
(ROOT (S (NP (NNS Mollusks)) (VP (MD can) (VP (VB be) (VP (VBN divided) (PP (IN into) (NP (CD seven) (NNS classes)))))) (. .)))
Mollusks can be divided into seven classes.