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

Example Input: Muscle type of cell function relies on microfilaments, which are the actin components of the cytoskeleton.
Example Output: What type of cell function relies on microfilaments, which are the actin components of the cytoskeleton?

Example Input: The main advantage of urea is its very low toxicity.
Example Output: The main advantage of urea is its very low what?

Example Input: Lichens are not a single organism, but rather an example of a mutualism.
Example Output:
Lichens are not a single organism, but rather an example of a what?