Answer: Endotherms and ectoderms
Step-by-step explanation:
Mammals like human beings, and many more animals, are endotherms can actively maintain their body temperature by the help of the process known as homeostasis by generating heat.
Such kind of animals are known as endotherms because they can regulate their body temperature.
The reptiles, birds and insects cannot maintain their body temperature so they are known as ectoderms. They are commonly known as cold blooded animals.