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

[EX Q]: Learned behavior is adaptive because they are flexible, capable of changing if the environment changes.
[EX A]: What kind of behaviors are adaptive because they are flexible, capable of changing if the environment changes?

[EX Q]: All life is built around the element carbon.
[EX A]: What element is all life built around?

[EX Q]: Vertebrata are characterized by the presence of backbone.
[EX A]:
Vertebrata are characterized by the presence of what?