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

[Q]: Protists are thought to be the oldest eukaryotes.
[A]: What is thought to be the oldest eukaryotes?


[Q]: Interconnected pathways through which carbon is recycled through the biotic and abiotic components of biosphere.
[A]: Interconnected pathways through which carbon is recycled through the biotic and abiotic components of what?


[Q]: Potential energy energy is stored in a person or object.
[A]:
What energy is stored in a person or object?