Dalueak by nature (theory of natural selection) is the essence. As follows:1. What is the same type of life inevitably differ somewhat. Also called variation2. There are many descendants living organisms, respectively, but the geometry of each type of creature, it has a number of almost constant because there were a number of deaths.3. living organisms need to be fighting for survival (struggle of existence) by some variable characteristics appropriate to the environment inevitably and reproductive live broadcasts to offspring.4. What are the most appropriate life only (survival the fittest) survive, and sustain their own clan, and cause. Natural selection occurs, different from the original species speciation. Organisms to survive is not necessarily strong creatures, but are appropriate for most environments.
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