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

Q: Saturated hydrocarbons hydrocarbons contain only single bonds between carbon atoms.

A: What hydrocarbons contain only single bonds between carbon atoms?
****
Q: The sporophyte stage is the dominant stage of the lifecycle of a fern.

A: Which is the dominant stage of the lifecycle of a fern?
****
Q: Neutrophils provide an early, rapid, and nonspecific defense against invading pathogens.

A:
What provides an early, rapid, and nonspecific defense against invading pathogens?
****