Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[Q]: Cells are small biological structures that make up all living things, including the human body.
[A]: What small biological structures make up all living things, including the human body?


[Q]: The bird ancestor that lived in trees developed wings, which is commonly associated with birds.
[A]: The bird ancestor that lived in trees developed what feature commonly associated with birds?


[Q]: Cell -> tissue -> organ -> organ system sequence represents the correct levels of organization for multicellular organisms.
[A]:
Which sequence represents the correct levels of organization for multicellular organisms?