TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Interconnected pathways through which carbon is recycled through the biotic and abiotic components of biosphere.

SOLUTION: Interconnected pathways through which carbon is recycled through the biotic and abiotic components of what?

PROBLEM: If two populations do not mate and produce fertile offspring, separate species result.

SOLUTION: If two populations do not mate and produce fertile offspring, what results?

PROBLEM: The water cycle ends with it repeats itself.

SOLUTION:
How does the water cycle end?