Q. Which of the following are warm-blooded animals?

1. Mammals
2. Birds
3. Fishes
4. Reptiles

Select the correct option from the codes given below:
Answer: Only 1 & 2
Notes: Mammals and birds are warm-blooded (endothermic) animals, able to regulate their body temperature internally. In contrast, fishes and reptiles are cold-blooded (ectothermic), relying on external environmental conditions to control their body temperature. Thus, only options 1 and 2—mammals and birds—are warm-blooded animals.