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

[EX Q]: Energy do ecosystems absorb on the earth.
[EX A]: What do ecosystems absorb on the earth?

[EX Q]: The double helix dna shape forms when the two nucleotide chains wrap around the same axis.
[EX A]: What distinctive dna shape forms when the two nucleotide chains wrap around the same axis?

[EX Q]: Allolactose inducer turns on the expression of the lac genes.
[EX A]:
Which inducer turns on the expression of the lac genes?