Simply put, evolution is change. It is change in groups of living things over time, a process that connects all forms of life to one another. Charles Darwin called evolution “descent with modification” from a common ancestor.
The evolution of living things has been occurring for billions of years and is responsible for the dazzling diversity of life on Earth. That is a fact. Details of the mechanisms of evolutionary change, such as mutation and natural selection, are still being studied and explained.
Individuals Don’t Evolve, But Populations Do.
Evolution refers to changes in groups—populations—of living things over time. Individual members of a population grow and develop, but they don’t evolve.
What does "Theory" mean?
The scientific meaning of “theory” is the most logical, best-tested, and best-substantiated explanation for an observed phenomenon. The theory of evolution by natural selection explains how species of living things—plants, animals, microbes—change over time.
A scientific theory is also predictive—it can tell what is likely to happen.
A scientific theory is different from a hypothesis, which is a scientific “concept” that has yet to be fully tested
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