Answer the following question given this paragraph: 

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.


Q: A statement that describes what always happens under certain conditions in nature is also known as what?

 Choices:

- theory

- hypothesis

- scientific motion

- scientific law

A:
scientific law
