( ( ( Corals and ) Coral ) ( Reefs . ) )
(ROOT (S (NP (NNP Corals) (CC and) (NNP Coral)) (VP (VBZ Reefs)) (. .)))
Corals and Coral Reefs.
(ROOT (S (NP (NNS Corals)) (VP (VBP build) (NP (NP (JJ hard) (NNS exoskeletons)) (SBAR (WHNP (WDT that)) (S (VP (VBP grow) (S (VP (TO to) (VP (VB become) (NP (NN coral) (NNS reefs)))))))))) (. .)))