Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

[Q]: Question: At equilibrium reactants and what are equally abundant? Answer: products
[A]: Reactants and products are equally abundant at equilibrium.

[Q]: Question: Fission is a type of radioactivity in which large nuclei spontaneously break apart into what? Answer: smaller nuclei
[A]: Fission is a type of radioactivity in which large nuclei spontaneously break apart into smaller nuclei.

[Q]: Question: What is continuously changing within a circuit in an analog signal? Answer: voltage
[A]:
An analog signal consists of continuously changing voltage in a circuit. For example, microphones encode sounds as analog signals.