theory of evolution | KidzSearch. Family-friendly safe search for kids.

The tree of life showing the three domains of life on Earth.

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.

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