Biography: Charles Darwin
Charles Robert Darwin, (1809 – 1882) was an English naturalist and geologist, best known for his contributions to "theory of evolution". He established that all species of life have descended over time from common ancestors, he introduced his scientific theory that this branching pattern of evolution resulted from a process that he called "natural selection", in which the struggle for existence has a similar effect to the artificial selection involved in selective breeding.
Survival of the fittest
Say giraffe number one has longer neck than giraffe number two - this helps giraffe one to reach higher and get more food from top of the trees. The longer neck gives giraffe one better chance of survival than giraffe two; which means in future generations all giraffes will have longer necks. Giraffes with short necks will go extinct. Note, it might take thousands of years for such changes to occur in species.
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