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: What combines with rain to form acid rain? Answer: nitrogen and sulfur oxides

Output: Courtesy of the U. S. EPA. Nitrogen and sulfur oxides combine with rain to form acid rain . Public Domain.

Input: Consider Input: Question: When do female reproductive organs mature? Answer: at puberty

Output: Female reproductive organs form before birth. However, they do not mature until puberty.

Input: Consider Input: Question: What are materials that have a low resistance to electrical current called? Answer: electrical conductors
Output: Materials that have low resistance to electric current are called electric conductors. Many metals are good electric conductors.