( ( The ( mesopelagic zone ) ) ( ( is ( often ( ( ( defined ( as ( being ( ( ( ( ( between 200 ) and ) 1000 ) meters ) deep ) ) ) ) , ) ( although ( this ( is ( a ( ( somewhat arbitrary ) delineation ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ mesopelagic) (NN zone)) (VP (VBZ is) (VP (ADVP (RB often)) (VBN defined) (PP (IN as) (S (VP (VBG being) (ADJP (NP (QP (IN between) (CD 200) (CC and) (CD 1000)) (NNS meters)) (JJ deep))))) (, ,) (SBAR (IN although) (S (NP (DT this)) (VP (VBZ is) (NP (DT a) (ADJP (RB somewhat) (JJ arbitrary)) (NN delineation))))))) (. .)))
The mesopelagic zone is often defined as being between 200 and 1000 meters deep, although this is a somewhat arbitrary delineation.
(ROOT (S (NP (DT The) (JJ photic) (NN zone)) (VP (VBZ extends) (ADJP (NP (CD 200) (NNS meters)) (JJ deep))) (. .)))
The photic zone extends 200 meters deep.