Birth rate, As we grow we might have to cut down on birth
<span>Vertebrates that are endothermic are birds and mammals. Endothermic organisms are able to regulate their own body temperature while ectothermic organisms depend on the temperature of the environment. Birds and mammals are endothermic organisms. Fish, amphibians, and reptiles are ectothermic organisms.</span>
Answer: Rattlesnake
Explanation: This is because it is cold-blooded and the rattlesnake is also the only cold-blooded animal on this list.
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