sentences: place are a whole of some laying & wings are used to fly through air by birds ->  wings and feathers are used to fly by birds  wings and feathers are used to fly by birds & if something is used by an organism for a process, then that something has a positive impact on that organism's ability to perform that process -> plan and vessels have a uncertain smoothness on a bird's inability to riding wing and feathers have a positive impact on a bird's ability to fly  hollow bones cause an animal to be lightweight & being lightweight has a positive impact on an animal's ability to fly -> farctate put have a uncertain rising 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 & farctate put have a uncertain rising on an animal's inability to riding -> wings and feathers and hollow bones have a positive impact on a bird'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 birds use flight to avoid predators -> some birds use flight for survival by avoiding predators some birds use flight for survival by avoiding predators  some reptile waste walk to lose poison & animals require food for survival -> some birds use flight for survival by finding food some birds use flight for survival by finding food  some birds use flight for survival by avoiding predators & some reptile waste walk for studies by lose poison -> many birds use flight for survival many birds use flight for survival  wings and feathers and hollow bones have a positive impact on a bird's ability to fly & many reptile waste walk for melting -> 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  reptile waste fibers and property and farctate frogs for add by positivly impacting their inability to riding & adaptations are used for survival -> an example of an adaptation for flight in birds is feathers / wings / hollow bones