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

Input: Consider Input: The sporophyte stage is the dominant stage of the lifecycle of a fern.

Output: Which is the dominant stage of the lifecycle of a fern?


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

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


Input: Consider Input: You call a substance that cannot be broken down to other substances by chemical reactions an element.


Output: What do you call a substance that cannot be broken down to other substances by chemical reactions.?