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.

[EX Q]: Question: What members of an ecosystem food chain take in food by eating producers or other living things? Answer: consumers
[EX A]: Consumers take in food by eating producers or other living things.

[EX Q]: Question: Electrons in the "outer shell" are also known as what kind of electrons? Answer: valence
[EX A]: Determine the total number of valence (outer shell) electrons. For cations, subtract one electron for each.

[EX Q]: Question: What is required when electrons are removed from an atom, and released from the process when an electron is added? Answer: energy
[EX A]:
When electrons are removed from an atom, that process requires energy to pull the electron away from the nucleus. Addition of an electron releases energy from the process.