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

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

PROBLEM: Population is an important level of organization in ecology and the unit of microevolution.

SOLUTION: What is an important level of organization in ecology and the unit of microevolution?

PROBLEM: Crops are usually planted in rows with bare soil in between the rows.

SOLUTION:
What are usually planted in rows with bare soil in between the rows?