( Agnathans ( ( ( ( are ectothermic ) , ) ( meaning ( they ( ( do not ) ( regulate ( their ( own ( body temperature ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Agnathans)) (VP (VBP are) (ADJP (JJ ectothermic)) (, ,) (S (VP (VBG meaning) (SBAR (S (NP (PRP they)) (VP (VBP do) (RB not) (VP (VB regulate) (NP (PRP$ their) (JJ own) (NN body) (NN temperature))))))))) (. .)))
Agnathans are ectothermic, meaning they do not regulate their own body temperature.
(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))))))))))) (. .)))