The 'Theory of Evolution' states that all living organisms have evolved from simple lifeforms.
Lamarck, a French biologist, had a theory that all animals evolved from primative worms, and that diffrentiation occured due to inheritance of aquried characteristics. His basic theory was that if your parents developed a certain characteristic, their offpsring would then inherit it. Applied to giraffes this meant that if a giraffe spent its life stretching for leaves, its offspring would be born with a slightly longer neck.
However, this theory was not accepted due to a lack of evidence. The generally accepted theory is that of Charles Darwin.
Darwin's theory in general is that a process of 'natural selection' has meant that only those organisms with characteristics most suited to their environent will survive and therefore produce offspring- passing on their successful genetic traits.
This proccess is also known as 'survival of the fittest.'
The fossil record has helped to prove this theory.
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