What are the two key concepts of Darwinism ?
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Branching descent and natural selection are the two key concepts of Darwinian Theory of Evolution.
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According to Darwin's theory of evolution, nature selects the fittest. Fitness is based on characteristics which are inherited. Therefore, there must be a genetic basis for getting selected and to evolve. Some organisms are better adapted to survive in an otherwise hostile environment. Adaptative ability is inherited. It has a genetic basis. Fitness is the end result of the ability to adapt and get selected by nature. Therefore, branching descent (inheritance) and natural selection are the two key concepts of Darwin's theory of evolution.
So, the correct answer is 'Branching descent and natural selection'.
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