Answer:
The correct answer is option A. birds can fly.
Explanation:
One characteristic that distinguish birds from all other animals is that birds have feathers. Birds are the only animals that have feathers, actually it is said that if an animal have feathers it must be a bird. Feathers serve many purposes for birds: they allow birds to fly, serve as insulators for their eggs and their young's, and also give them protectrom from water and cold temperatures.
