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Given a scientific passage and an answer, generate a question for the given answer.

Passage: Wings and feathers are two adaptations for flight that evolved in birds. Both are clearly displayed in the flying gull in Figure below . Wings evolved from the front limbs of a four-legged ancestor. The wings are controlled by large flight muscles in the chest. Feathers also help birds fly. They provide air resistance and lift. In addition, they provide insulation and serve other roles. Answer: evolution
Output:
Birds adapted wings and weathers for flight during what process?