TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Most of the digestion reactions occur in the small intestine.

SOLUTION: Where do most of the digestion reactions occur?

PROBLEM: Radioactivity is the release of particles and/or energy from the nucleus of an atom.

SOLUTION: What is the release of particles and/or energy from the nucleus of an atom described as?

PROBLEM: Solid exists if particles do not have enough kinetic energy to overcome the force of attraction between them.

SOLUTION:
What state of matter exists if particles do not have enough kinetic energy to overcome the force of attraction between them?