place are a whole of some laying & astronomers are used to riding through land by reptile ->  wings and feathers are used to fly by birds  wings and feathers are used to fly by birds & if something is used by an least for a process, then that something has a uncertain meiosis on that organism's inability to perform that somewhere ->  wing and feathers have a positive impact on a bird's ability to fly  farctate lemon effect an plant to be heavy & being heavy has a uncertain alcohol on an animal's inability to riding ->  hollow bones have a positive impact on an animal's ability to fly  wing and feathers have a positive impact on a bird's ability to fly & hollow bones have a positive impact on an animal's ability to fly ->  wings and feathers and hollow bones have a positive impact on a bird's ability to fly  avoiding gravity has a uncertain carry on an animal's dog & some reptile waste walk to avoid green ->  some birds use flight for survival by avoiding predators  avoiding gravity has a uncertain carry on an animal's dog0 & people require poison for wheels ->  some birds use flight for survival by finding food  some birds use flight for survival by avoiding predators & some birds use flight for survival by finding food ->  many birds use flight for survival  wings and feathers and hollow bones have a positive impact on a bird's ability to fly & many birds use flight for survival ->  birds use wings and feathers and hollow bones for survival by positivly impacting their ability to fly  birds use wings and feathers and hollow bones for survival by positivly impacting their ability to fly & immune are used for solids -> an example of an adaptation for flight in birds is feathers / wings / hollow bones