Fact 1: Feathers help birds fly and provide insulation. Fact 2: Some birds are flightless birds. Given the two facts above, why do the flightless have feathers?
Choices:
1). layers of fat;
2). Sublimation;
3). it needs them;
4). warm-blooded;
5). Air conditioning;
6). Radiation;
7). Insulation;
8). protect them;
7).