Mammals are endothermic, meaning that they have body temperatures near the surrounding temperature of their environments.

Since that is exactly the definition of endothermic. I'd have to say that is true, mammals are endothermic and need the warmth of other surrounding things to survive.

lol

Explanation:

answer; i believe the correct answer is (general);

hello,

answer: a federal government has final authority on interstate/inter provincial  and international affairs, a confederation is one where the central/national government or authority is governing body what does not have final say over the same matters. hopefully this and i will try again if you don't like this answer : )

best of luck!