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

Ex Input:
Carbon dioxide is an example of a material that easily undergoes sublimation.

Ex Output:
Carbon dioxide is an example of a material that easily undergoes what?


Ex Input:
The energy stored in the organic molecules of food ultimately comes from the sun.

Ex Output:
The energy stored in the organic molecules of food ultimately comes from where?


Ex Input:
Yeast fermentation causes holes in bread.

Ex Output:
What causes holes in bread?