Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.

Example Input: Fact: An example of a fossil is a paw print in rock
Example Output: An example of a fossil is a paw print in what?

Example Input: Fact: fertilizers are a source of pollution
Example Output: What are some of the risks of using fertilizer?

Example Input: Fact: if an organism dies then the population of that organism will decrease
Example Output:
After the chickens were let into the field, the population of worms?