( ( ( ( They ( ( ( are vertebrates ) and ) ( ( are also ) ectothermic ) ) ) ; ) ( ( ( ( they ( ( can not ) ( regulate ( their ( own ( body heat ) ) ) ) ) ) , ) so ) ( they ( ( depend ( on sunlight ) ) ( to ( become ( ( warm and ) active ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (PRP They)) (VP (VP (VBP are) (ADJP (JJ vertebrates))) (CC and) (VP (VBP are) (ADVP (RB also)) (ADJP (JJ ectothermic))))) (: ;) (S (S (NP (PRP they)) (VP (MD can) (RB not) (VP (VB regulate) (NP (PRP$ their) (JJ own) (NN body) (NN heat))))) (, ,) (IN so) (S (NP (PRP they)) (VP (VBP depend) (PP (IN on) (NP (NN sunlight))) (S (VP (TO to) (VP (VB become) (ADJP (JJ warm) (CC and) (JJ active)))))))) (. .)))
They are vertebrates and are also ectothermic; they cannot regulate their own body heat, so they depend on sunlight to become warm and active.
(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))))))))))) (. .)))