Science is a self-correcting process. While established theories are robust and supported by vast evidence, they are not immutable. If new, compelling evidence arises from observations or experiments that contradicts an existing theory, or if a new theory better explains all available evidence, then the older theory may be modified or even replaced. This continuous refinement based on new data is what makes science "ever-evolving." Options 1, 2, and 4 contradict this fundamental principle of scientific progress.