Given the question: You are presented with the question "What group of animals do frogs belong to?" and the following answer choices: - four limbs - animals - fish - warm-blooded - reptiles - Amphibians - more abundant - mammals Now knowing that amphibians have a relatively complex circulatory system with a three-chambered heart and frogs have a three-chambered heart, consisting of two atria and a single ventricle, choose the best answer.
The answer is:
Amphibians