( In ( Coral Reefs ) )
(ROOT (PP (IN In) (NP (NNP Coral) (NNPS Reefs))))
In 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)))))))))) (. .)))