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Evolution is a scientific theory used by biologists. It explains how animals and plants changed over a long time, and how they have come to be the way they are.

Earth is very old, about 4.5 billion years. By studying the layers of rock that make up Earth's crust, scientists can find out about its past. This 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.

The theory of evolution is the basis of modern biology. Nothing in biology makes sense without it.

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你知道嗎？

From a collection of Wikipedia's articles:

... that because of U.S. President Woodrow Wilson (pictured) the League of Nations was founded and he received the Nobel Peace Prize in 1919?

... that Antarctica is the largest and coldest desert?

... that at age 52, Shinzo Abe was the youngest person elected as prime minister of Japan in its post-war history?

... that sometime during the 17th century, the decorated walking stick replaced the sword carried by aristocrats as a status symbol?

... that in some cultures, women would sometimes be naked until marriage, because people thought they had nothing to hide?

... that even though they were first described in 1839, hamsters were not successfully bred and domesticated until 1939?

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