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 element once commonly used in paint and gasoline has now been found to have dangerous effects? Answer: lead
[EX A]: lead: An element that was once commonly used in gasoline and paint, is now found to have dangerous effects, such as brain damage. Lead contamination has many harmful effects on the body.

[EX Q]: Question: Depending on how matter interacts with light, it can be classified as transparent, translucent, or what? Answer: opaque
[EX A]: Matter can be classified as transparent, translucent, or opaque depending on how it interacts with light.

[EX Q]: Question: The brain and spinal cord are part of what system? Answer: central nervous system
[EX A]:
The brain and spinal cord make up the central nervous system.