( ( ( ( Corals ( , ( hydra , ) ) ) & ) ( sea anemones ) ) ( ( exist ( in ( the ( polyp form ) ) ) ) ( as adults ) ) )
(ROOT (S (NP (NP (NNS Corals) (, ,) (NN hydra) (, ,)) (CC &) (NP (NN sea) (NNS anemones))) (VP (VBP exist) (PP (IN in) (NP (DT the) (NN polyp) (NN form))) (PP (IN as) (NP (NNS adults))))))
Corals, hydra, & sea anemones exist     in the polyp form as adults
(ROOT (S (NP (NNS Hydras) (CC and) (NN sea) (NNS anemones)) (VP (VBP are) (NP (NP (NNS examples)) (PP (IN of) (NP (NN apolyp))))) (. .)))