Which statement describes a scientific law?

a law states how something behaves and explains why.
a law is a proven fact that cannot be changed.
a law changes based on new observations and testing.
a law is based on a single hypothesis or observation.

A law is a proven fact that cannot be changed.

When a hypothesis is tested repeatedly and gives out same results universally, then it becomes a scientific law. The difference between scientific theory is that it gives detailed explanation about how and why things  behave, the way they behave. On the other hand, a scientific law is just a statement that explains the behavior of natural phenomenons. A law is a proven fact that cannot be changed because it becomes law only after multiple times testing of the hypothesis.

the five characteristics of adolescence are biological growth and development, and undefined status, increased decision making, increased pressure and the search of self.