( ( Much ( of ( ( the ( aphotic ( zone 's ) ) ) energy ) ) ) ( ( is ( supplied ( by ( ( the ( open ocean ) ) ( in ( ( the form ) ( of detritus ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (RB Much)) (PP (IN of) (NP (NP (DT the) (JJ aphotic) (NN zone) (POS 's)) (NN energy)))) (VP (VBZ is) (VP (VBN supplied) (PP (IN by) (NP (NP (DT the) (JJ open) (NN ocean)) (PP (IN in) (NP (NP (DT the) (NN form)) (PP (IN of) (NP (NNS detritus))))))))) (. .)))
Much of the aphotic zone's energy is supplied by the open ocean in the form of detritus.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (DT the) (JJ lightless) (NN part)) (PP (IN of) (NP (DT the) (NN ocean) (JJ aphotic) (NN zone))))) (. .)))