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

[EX Q]: Radioactive decay can give off energy and particles.
[EX A]: Radioactive decay can give off energy and what else?

[EX Q]: Gastric emptying is regulated by both the stomach and the duodenum.
[EX A]: Gastric emptying is regulated by both the stomach and what other digestive structure?

[EX Q]: Period is the time interval required for one complete wave to pass a point called.
[EX A]:
What is the time interval required for one complete wave to pass a point called?