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Evolution The theory of evolution says that all living things on Earth, A_______, come from a common ancestor by slowly changing down the generations. Darwin suggested that the way living things changed over time is through natural selection. This is the better survival and reproduction of those B_______. Fitting into the place where you live is called adapting. Those who fit best into the place where they live, the best adapted, have the best chance to survive and breed. Those who are less well-adapted C_______. If they do not survive well enough to raise young, that means they do not pass on their genes. In this way, the species gradually changes.
The first chapter of the Origin deals with domesticated animals, D_______. Darwin reminded readers of the huge changes mankind had made in its domestic animals, which were once wild species. The changes were brought about by selective breeding — choosing animals with desirable characters to breed from. This had been done generation after generation, E_______. Perhaps what man had done deliberately, might happen in nature, where some would leave more offspring than others.
Darwin noticed that although young plants or animals are very similar to their parents, F_______and there is always a range of shape, size, colour and so on. Some of these differences the plant or animal may have got from their own ancestors, but some are new and caused by mutations.

1. including plants, animals and microbes
2. tend not to survive
3. such as cattle and dogs
4. it would have a better chance to survive
5. that best fit their environment
6. no two are exactly the same
7. until our modern breeds were produced

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