TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: The brain is the most complex organ in the human body.

SOLUTION: What is the most complex organ in the human body?

PROBLEM: Water affects the availability of oxygen important element in aquatic environments and in flooded soils.

SOLUTION: Water affects the availability of what important element in aquatic environments and in flooded soils?

PROBLEM: Organisms categorized by ring species species descriptor demonstrate a version of allopatric speciation and have limited regions of overlap with one another, but where they overlap they interbreed successfully.

SOLUTION:
Organisms categorized by what species descriptor demonstrate a version of allopatric speciation and have limited regions of overlap with one another, but where they overlap they interbreed successfully?