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.

Input: Consider Input: Question: The total number of protons and neutorns in an atom is called what? Answer: mass number

Output: The mass number is defined as the total number of protons and neutrons in an atom.

Input: Consider Input: Question: Mixtures of materials called alloys contain at least one of what type of material? Answer: metal

Output: Alloys are mixtures of materials, at least one of which is a metal.

Input: Consider Input: Question: The eukaryotic cell cycle is regulated by a what? Answer: molecular control system
Output: 12.3 The eukaryotic cell cycle is regulated by a molecular control system.