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Which of the following statements is correct regarding the evolution of flight?
a. the evolution of feathers on wings was initially to support fight in non-avian dinosaurs
b. the bottom-up theory postulates that the evolution of flight started with the use of wings to glide from branch to branch.
c. the top-down theory postulates that the evolution of flight started with flapping to aid in generating lift off the ground.
d. the wing-assisted incline running theory postulates that wings were initially used to maintain balance while climbing up slopes.
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