( Reptiles ( ( ( ( are ( ( ( cold-blooded , ) or ) ectothermic ) ) , ) ( meaning ( that ( ( their heat ) ( come ( from ( their environment ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Reptiles)) (VP (VBP are) (ADJP (ADJP (JJ cold-blooded)) (, ,) (CC or) (ADJP (JJ ectothermic))) (, ,) (S (VP (VBG meaning) (SBAR (IN that) (S (NP (PRP$ their) (NN heat)) (VP (VBP come) (PP (IN from) (NP (PRP$ their) (NN environment))))))))) (. .)))
Reptiles are cold-blooded, or ectothermic, meaning that their heat come from their environment.
(ROOT (S (NP (NNS Reptiles)) (VP (VBP are) (VP (VBN described) (PP (IN by) (NP (NP (DT the) (NN term) (NN ectothermic)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ means) (SBAR (S (NP (PRP$ their) (JJ internal) (NN temperature)) (VP (VBZ depends) (PP (IN on) (NP (NP (DT the) (NN temperature)) (PP (IN of) (NP (PRP$ their) (NN environment))))))))))))))) (. .)))
Reptiles are described by the term ectothermic, which means their internal temperature depends on the temperature of their environment.