Evolution is the process that has led to the emergence and change of species which are alive on Earth. The earliest organisms were very basic cells, algae, or bacteria that appeared 3.8 billion years ago. Since then, life forms have diversified and adapted to their surroundings. Hence, all living species today share a common ancestor. Also, it can be the change in the genetic composition of a population during consecutive generations, resulting from natural selection acting on the genetic variation among individuals. The outcome will be that there will be the development of new species.
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Source: http://www.lexicon-biology.com/biology/definition_45.html, 8th April 2007
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chan li ying [evolution expert]
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