Answer: The correct answer is -
1. Mammals
A-endotherm
2. Fish
B-ectotherm
Step-by-step explanation:
Ectotherms are the animals whose body temperature depends on external environment, such as heated rock surface or sunlight (such as repltiles, fishes, amphibians, and invertebrates).
On the other hand, endotherms are the organisms that can regulate their internal body temperature and it is not dependent on the external sources (such as mammals like human beings).