( ( ( The ( two factors ) ) ( that ( change ( ( the most ) ( in ( the water ) ) ) ) ) ) ( vertically ( ( are ( ( ( ( light intensity ) ( -LRB- ( ( highest ( at ( ( the ( ( top and ) disappearing ) ) ( with depth ) ) ) ) -RRB- ) ) ) and ) ( pressure ( -LRB- ( ( increases ( with depth ) ) -RRB- ) ) ) ) ) . ) ) )
(ROOT (S (NP (NP (DT The) (CD two) (NNS factors)) (SBAR (WHNP (WDT that)) (S (VP (VBP change) (NP (NP (DT the) (JJS most)) (PP (IN in) (NP (DT the) (NN water)))))))) (ADVP (RB vertically)) (VP (VBP are) (NP (NP (NP (JJ light) (NN intensity)) (PRN (-LRB- -LRB-) (NP (NP (JJS highest)) (PP (IN at) (NP (NP (DT the) (NN top) (CC and) (NN disappearing)) (PP (IN with) (NP (NN depth)))))) (-RRB- -RRB-))) (CC and) (NP (NP (NN pressure)) (PRN (-LRB- -LRB-) (NP (NNS increases) (IN with) (NN depth)) (-RRB- -RRB-))))) (. .)))
The two factors that change the most in the water vertically are light intensity (highest at the top and disappearing with depth) and pressure (increases with depth).
(ROOT (S (NP (NNP Depth) (CC and) (NNP density)) (VP (VBP are) (NP (NP (DT the) (CD two) (NNS factors)) (SBAR (WHNP (WDT that)) (S (VP (VBP affect) (NP (NP (DT the) (NN pressure)) (PP (IN of) (NP (NNS fluids))))))))) (. .)))