( ( The ( aphotic zone ) ) ( ( ( ( ( is ( below ( ( the level ) ( of ( effective ( light penetration ) ) ) ) ) ) , ) and ) ( represents ( ( a majority ) ( of ( ( the ( ocean 's ) ) volume ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ aphotic) (NN zone)) (VP (VP (VBZ is) (PP (IN below) (NP (NP (DT the) (NN level)) (PP (IN of) (NP (JJ effective) (JJ light) (NN penetration)))))) (, ,) (CC and) (VP (VBZ represents) (NP (NP (DT a) (NN majority)) (PP (IN of) (NP (NP (DT the) (NN ocean) (POS 's)) (NN volume)))))) (. .)))
The aphotic zone is below the level of effective light penetration, and represents a majority of the ocean's volume.
(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))))) (. .)))