Final answer:
The theory of evolution by Charles Darwin is referred to as the theory of evolution because it is well-supported by experimental evidence and widely accepted by the scientific community. It is a concept that has undergone extensive testing and refinement over time.
Step-by-step explanation:
The theory of evolution as proposed by Charles Darwin is referred to as the theory of evolution because it is a well-supported statement based on experimental evidence and widely accepted by the scientific community. Contrary to what some people think, a scientific theory is not a guess but a concept that has undergone extensive testing and refinement over time. It is important to note that theories in science are subject to constant testing and modification based on new evidence.