Charles Darwin was an English naturalist who studied variation in plants and animals during a five-year voyage around the world in the 19th century.He explained his ideas on evolution in a book called, 'On the Origin of Species', published in 1859.
Our bodies would have changed to suit the Earth's conditions.
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These simple life forms first developed more than 3 billion years ago (the Earth is about 4.5 billion years old).
The timeline below shows some of the key events in the evolution of life on Earth, from the first Individuals that are poorly adapted to their environment are less likely to survive and reproduce.
This means that their genes are less likely to be passed to the next generation.
Given enough time, a species will gradually evolve.
You need to remember that variation can be caused by both genes and the environment.
But it is only variation caused by genes that can be passed on to the next generation.