if you see a group of people you can find many variation. how will you appreciate the role of variation
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1. New species are formed
2. Has variation
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Sometimes, there are some species whose survival converts into a difficulty due to modification in environmental conditions.
At that time, those species need to change themselves in order to live.
Thus variations take place for their existence, and increases their chance of existence in their newly, changed environment and so variation in needed.
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