The theory of Darwin and Wallace
Darwin and Wallace have proposed a theory of the new species due to natural selection. The theory of natural selection (theory of natural selection) is a summary as follows:
1.The same organism is different, a little known as variation
2. Life children a lot accordingly geometry. But each living thing is the amount of almost constant because there are a number of one dead
3.The creatures have a fight for survival (struggle of existence) by style variation, some characteristics which is appropriate to the environment. Will continue to live and reproduce transfer to children
4.The most reasonable creatures only survived (survival the fittest) and to their species and cause Natural selection is the difference. From species to species more original new creatures to survive.The strongest creature But as the creatures that fit the environment as much as possible. In case the giraffe long neck, explaining according to Darwin's theory that the giraffe has ancestors. A short neck, but a variation with a long neck.The leaves are better than the short neck, and inheritance, neck long offspring, and the neck สั้นหาอาหาร poorly or taking food. Fight the long neck not finally died, making it currently only giraffe long neck only
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