( ( The herptiles ) ( ( ( is ectothermic ) ( which ( means ( they ( ( can not ) ( regulate ( their ( body temperatures ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS herptiles)) (VP (VBZ is) (ADJP (JJ ectothermic)) (SBAR (WHNP (WDT which)) (S (VP (VBZ means) (SBAR (S (NP (PRP they)) (VP (MD can) (RB not) (VP (VB regulate) (NP (PRP$ their) (NN body) (NNS temperatures)))))))))) (. .)))
The herptiles is ectothermic which means they cannot regulate their body temperatures.
(ROOT (S (NP (NNP Ectothermic)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (NNS animals)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (RB not) (VP (VB raise) (NP (PRP$ their) (NN body) (NN temperature)) (PP (IN on) (NP (PRP$ their) (JJ own))))))))))) (. .)))