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

Example Input: The sporophyte stage is the dominant stage of the lifecycle of a fern.
Example Output: Which is the dominant stage of the lifecycle of a fern?

Example Input: Glycerol is a triol, an alcohol which contains three hydroxl functional groups.
Example Output: Glycerol is a triol, an alcohol which contains three what?

Example Input: Since europeans settled in the united states, about 33 percent percentage of topsoil has eroded away.
Example Output:
Since europeans settled in the united states, about what percentage of topsoil has eroded away?