Final answer:
A scientific theory is a widely accepted explanatory idea that is broader in scope than a hypothesis and is supported by a large body of evidence. The theory of evolution using natural selection is an example of a scientific theory.
Step-by-step explanation:
Scientists regard Darwin's concept of evolution using natural selection as a theory. A scientific theory is a widely accepted explanatory idea that is broader in scope than a hypothesis. It is a well-substantiated explanation of some aspect of the natural world, based on a large body of facts that have been repeatedly confirmed through observation and experimentation.
The theory of evolution using natural selection is supported by a large amount of evidence and explains how living things have changed over time and how modern living things have descended from ancient life forms. The acceptance of a scientific theory is based on its consistency with empirical evidence and its ability to explain and predict observed phenomena in a particular field of study.