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

Lying with their mouths open, a behavior called gaping, probably serves the function of cooling down for crocodiles.
Lying with their mouths open, a behavior called gaping, probably serves what function for crocodiles?

Collision theory states that chemical reactions occur when atoms, ions, or molecules collide.
What states that chemical reactions occur when atoms, ions, or molecules collide?

Eight-membered rings does the stable form of sulfur at room temperature contain.

What does the stable form of sulfur at room temperature contain?