Why do the flightless have feathers?
layers of fat Sublimation it needs them warm-blooded Air conditioning Radiation Insulation protect them
A B C D E F G H
Some birds are flightless birds.
Feathers provide insulation for the flightless. 
Why do the flightless have feathers? (A) layers of fat (B) Sublimation (C) it needs them (D) warm-blooded (E) Air conditioning (F) Radiation (G) Insulation (H) protect them