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

[EX Q]: Once a plant cell becomes specialized, divide can they no longer do.
[EX A]: Once a plant cell becomes specialized, what can they no longer do?

[EX Q]: Socket secures teeth in the mouth.
[EX A]: What secures teeth in the mouth?

[EX Q]: Iguassu falls is the largest waterfall on the planet.
[EX A]:
Which waterfall series is the largest on the planet?