( ( ( ( These ( are ( ectothermic ( ( -LRB- ( poikilothermic -RRB- ) ) animals ) ) ) ) and ) ( ( their ( body temperature ) ) ( conforms ( to ( ( the temperature ) ( of ( the ( surrounding water ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT These)) (VP (VBP are) (NP (JJ ectothermic) (PRN (-LRB- -LRB-) (ADJP (JJ poikilothermic)) (-RRB- -RRB-)) (NNS animals)))) (CC and) (S (NP (PRP$ their) (NN body) (NN temperature)) (VP (VBZ conforms) (PP (TO to) (NP (NP (DT the) (NN temperature)) (PP (IN of) (NP (DT the) (VBG surrounding) (NN water))))))) (. .)))
These are ectothermic (poikilothermic) animals and their body temperature conforms to  the temperature of the surrounding water.
(ROOT (S (NP (JJ Ectothermic) (NNS vertebrates)) (VP (VBP control) (NP (NN body) (NN temperature)) (PP (TO to) (NP (NP (RB just) (DT a) (JJ limited) (NN extent)) (PP (IN from) (NP (DT the) (NN outside))))) (PP (IN by) (S (VP (VBG changing) (NP (NN behavior)))))) (. .)))