Basic theory of evolution - all species have evolved from simple life forms. The simple life forms first developed more than 3 billion years ago.
Evolution has taken place over millions of years. Charles Darwin wrote one of the first major scientific books on this subject.
Darwin's ideas caused a lot of controversy, as they conflict with religious views about the creation of the world and the creatures living in it.
Charlles Darwin:
- English naturalist - studied variation in animals and plants.
- Explained his ideas on evolution in a book called 'On the Origin of Species'.
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