Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: The bird ancestor that lived in trees developed wings, which is commonly associated with birds.

Answer: The bird ancestor that lived in trees developed what feature commonly associated with birds?


Question: Muscle groups are controlled by the motor cortex .

Answer: Muscle groups are controlled by what mechanism?


Question: Under appropriate conditions, the attractions between all molecules in gas state will cause them to form liquids or solids.

Answer:
Under appropriate conditions, the attractions between all molecules in what state will cause them to form liquids or solids?