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: Matter can exist either as a pure substance or as a combination of what? Answer: different substances
[EX A]: The properties of matter, both physical and chemical, depend on the substances that matter is made of. Matter can exist either as a pure substance or as a combination of different substances.

[EX Q]: Question: The enteric nervous system provides intrinsic innervation, and the autonomic nervous system provides this? Answer: extrinsic innervation
[EX A]: layers: mucosa, submucosa, muscularis, and serosa. The enteric nervous system provides intrinsic innervation, and the autonomic nervous system provides extrinsic innervation.

[EX Q]: Question: In a longitudinal wave, what term is a measure of how compressed particles of the medium become when the wave passes through? Answer: amplitude
[EX A]:
In a longitudinal wave, amplitude is a measure of how compressed particles of the medium become when the wave passes through. The closer together the particles are, the greater the amplitude.