( and ( ( influence ( from ( deep-ocean currents ) ) ) . ) )
(ROOT (S (CC and) (VP (VB influence) (PP (IN from) (NP (JJ deep-ocean) (NNS currents)))) (. .)))
and influence from deep-ocean currents.
(ROOT (S (NP (JJ Deep) (NNS currents)) (VP (VBP are) (VP (VBN caused) (PP (IN by) (NP (NP (NNS differences)) (PP (IN in) (NP (NN density))))) (PP (IN at) (NP (NP (DT the) (NN top) (CC and) (NN bottom)) (PP (IN of) (NP (DT the) (NN ocean))))))) (. .)))