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: A diet rich in calcium and vitamin d may reduce the risk of osteoporosis and related bone fractures.

A: A diet rich in calcium and what vitamin may reduce the risk of osteoporosis and related bone fractures?
****
Q: Groupings of related organs in the human body are referred to as "organ" systems.

A:
Groupings of related organs in the human body are referred to as "organ" what?
****