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

Input: Consider Input: Restoration ecologists type of ecologists work to identify and manipulate the processes that most limit recovery of ecosystems from disturbances.

Output: What type of ecologists work to identify and manipulate the processes that most limit recovery of ecosystems from disturbances?

Input: Consider Input: Optics explains the behavior of visible light and electromagnetic waves.

Output: What type of physics explains the behavior of visible light and electromagnetic waves?

Input: Consider Input: Twice a year often do partial lunar eclipses occur.
Output: How often do partial lunar eclipses occur?