Yes, and Gravity is a theory, not a fact, regarding things falling.
In Science, any interpretation of data is a Theory, not a Law or a fact.
A Hypothesis is a wild assed guess that might become a Theory after sufficient testing.
Unfortunately, general usage has confused the terms fact, Law, Theory and Hypothesis.
So9
No one has ever observed the materialistic evolution of any species. However, it cannot be classified as a law. Hence, it is merely a theory.
Actually, there's a difference between a hypothesis and a wild-assed guess. A hypothesis is testable. A WAG isn't. If the hypothesis passes the test, then it's a theory. If it fails, it's simply a failed hypothesis and not worthy of further consideration, unless it can be modified and re-tested.