Which among the following are the functions of feathers?

*There may be more than one correct option.

The correct options are
B Feathers keep a bird's body warm.
C Feathers provide the lift and thrust enabling the bird to fly in the air.
Birds have feathers on their body. Feathers cover a bird's body and provide insulation to it by keeping them warm. They also provide the lift and thrust, enabling the bird to fly in the air.