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

[EX Q]: You call the hard case that surrounds the soft parts of some animals the exoskeleton.
[EX A]: What do you call the hard case that surrounds the soft parts of some animals?

[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]: In atherosclerosis, thickening of an arterial wall due to plaque formation can restrict blood flow through the artery.
[EX A]:
In atherosclerosis, thickening of an arterial wall due to this can restrict blood flow through the artery?