Q: Given a scientific passage and an answer, generate a question for the given answer.
Passage: Scientists think of nature as a single system controlled by natural laws. Scientists strive to increase their understanding of the natural world by discovering natural laws. Laws of nature are expressed as scientific laws. A scientific law is a statement that describes what always happens under certain conditions in nature. Answer: scientific law
A:
A statement that describes what always happens under certain conditions in nature is also known as what?