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Evolution is a scientific theory used by biologists. It explains how living things change over a long time, and how they have come to be the way they are.
The Earth has been around for a very long time. By doing research on the layers of rock, we can find out about its past. That kind of research is called historical geology.
We know that living things have changed over time, because we can see their remains in the rocks. These remains are called fossils. So we know that the animals and plants of today are different from those of long ago. And the further we go back, the more different the fossils are. How has this come about? Evolution has taken place. That evolution has taken place is a fact, because it is overwhelmingly supported by many lines of evidence. At the same time, evolutionary questions are still being actively researched by biologists.