Marine reptiles are ectothermic. What does ectothermic mean?
Relying on the environment to regulate body temperature
Birds are ______________ ; they are the first group of vertebrates capable of regulating and maintaining a constant body temperature, independent of their surroundings.
endothermic
The true seals, such as the monk seal and elephant seal, differ from sea lions in that they _______________ have an external ear, have a relatively short neck, and use their rear flippers, rather than their front flippers, for propulsion.
do not