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

Macroevolution happens when forces of evolution work over a long period of time.
What happens when forces of evolution work over a long period of time?

Moving air masses is the main reason for weather change.
What is the main reason for weather change?

Mechanical to sound energy transfer occurs when a student blows a whistle.
Which energy transfer occurs when a student blows a whistle?