metabolic

definition: 
Relating to or deriving from the metabolism of a living organism:
sentence: 
Endotherms are animals that maintain a constant body temperature even when environmental temperatures fluctuate. In contrast, the environment regulates the body temperature of ectotherms and thus their metabolic rate tends to be lower than the metabolic rates of endotherms, which must maintain a high, constant body temperature.
difficulty: 
easy
toefl frequency: 
2
toefl classification: