( They ( ( ( ( are ( cold-blooded ( -LRB- ( ectothermic -RRB- ) ) ) ) , ) ( meaning ( ( their ( inner temperature ) ) ( varies ( with ( ( the temperature ) ( in ( the environment ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP are) (ADJP (ADJP (JJ cold-blooded)) (PRN (-LRB- -LRB-) (ADJP (JJ ectothermic)) (-RRB- -RRB-))) (, ,) (S (VP (VBG meaning) (SBAR (S (NP (PRP$ their) (JJ inner) (NN temperature)) (VP (VBZ varies) (PP (IN with) (NP (NP (DT the) (NN temperature)) (PP (IN in) (NP (DT the) (NN environment))))))))))) (. .)))
They are cold-blooded (ectothermic), meaning their inner temperature varies with the temperature in the 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.