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Evolution is the theory that organisms change over time. They change to

adapt to their surroundings and ultimately they change to survive. This is

where the term “Survival of the fittest” come in. Survival of the fittest is the

process of natural selection where the ones that were the most adapted to

a particular environment survived and those that were not, died.


Charles Darwin created the theory of evolution.Darwin studied plants and

animals for nearly 30 years. He then wrote his ideas in his book, origin of



The theory of evolution also highlighted that in some way shape or form all

organisms are related.It illustrated that species with similar characteristics

are often related for example chimpanzees and humans.These characteristics

mean the two organisms often look alike and behave in similar ways.


Sometimes two organisms may look alike but may be from completely different

ancestors. An example for this is sharks and dolphins, which look alike but are

not related. Evolutionary trees highlight this. Dolphins have a similar ancestor

to the whale but only have a far ancestor to the shark.

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Related Topics

Natural Selection                                 Extinction