Multiple choice Which of the following classes of animal belongs to poikilothermy? Amphibia Aves Mammals Reptilia 1 and 2 1 and 4 2 and 3 2 and 4 3 and 4 Reveal answer Fill a bubble to check yourself B Correct answer Explanation A poikilotherm is an organism whose internal temperature varies considerably. Both amphibians as well as reptiles are poikilothermal animals.