Given a statement, generate a question such that the answer is contained in that statement.

[EX Q]: h2o is essential for all plants on Earth
[EX A]: What is essential for all plants on Earth?

[EX Q]: Smog emissions are dangerous.
[EX A]: What emissions are dangerous?

[EX Q]: Some species of cold blooded animals can go several weeks between eating
[EX A]:
How long can some cold blooded animals go between eating and eating?