Laws Vs. Theories
A law in science is something that has been proven and comes from observations.
An example of a proven Scientific Law:
A theory is something that is being examined through testing such as the scientific method and it develops from ones inferences.
An example of a theory is Charles Darwin's Theory of Evolution:
Charles developed a theory that all species of life evolved from a common ancestor. Humans are believed to share a common ancestor with apes and chimpanzees.