The two key concepts of Darwinian theory of evolution are

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use and disuse, and inheritance of acquired characters

branching descent and natural selection

branching descent and mutation

reproductive isolation and mutation

answer is B.

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Detailed Solution

Nature selects the fittest, according to Darwin's theory of evolution. Fitness is determined by hereditary qualities. As a result, there must be a genetic basis for selection and evolution. Some species are more adapted to survive in a hazardous environment than others. The ability to adapt is inherited. It has a genetic component. The ability to adapt and be selected by nature is the outcome of fitness. As a result, Darwin's theory of evolution is based on two important concepts: branching descent (inheritance) and natural selection.

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