Possible answers:
1). elephants;
2). fur seals;
3). bacteria;
4). alpacas;
5). tree squirrels;
6). animals;
7). batteries;
8). the Sun;
Q: Fact 1: Mammals generate heat mainly by keeping their metabolic rate high. Fact 2: Gray Squirrel Management Tree squirrels are common Alabama mammals. Given the two facts above, what generate heat mainly by keeping their metabolic rate high?
A:
5).