Theory discovered by Charles Darwin that the species that is better adapted to the environment will survive and produce better offspring.
In some environments, the length of a giraffe's neck may vary. The length of the giraffe's neck depends on the source of food available. For example, in an environment mainly with shrubs and bushes, the giraffe's neck will be shorter. However, in an environment with tall trees, the length of a giraffe's neck will be longer. The giraffes will not survive in each others environment as they will starve due to the inability to reach their food.
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