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

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


[Q]: The opening in the front of the eye is called pupil.
[A]: What is the opening in the front of the eye called?


[Q]: Lymph capillaries structure collect fluid that leaks out from blood capillaries.
[A]:
What structure collect fluid that leaks out from blood capillaries?