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

Example Input: An acorn growing into an adult tree will take the longest time to observe.
Example Output: Which of these will take the LONGEST time to observe?

Example Input: Learned behavior is adaptive because they are flexible, capable of changing if the environment changes.
Example Output: What kind of behaviors are adaptive because they are flexible, capable of changing if the environment changes?

Example Input: Scientists know that some mountains were once at the bottom of an ocean because marine fossils have been found on the peaks of some mountains.
Example Output:
How do scientists know that some mountains were once at the bottom of an ocean?