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B
Genetic variations
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C
Isolation
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D
All of the above
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Solution
The correct option is C All of the above
The theory of evolution by natural selection, first formulated in Darwin's book "On the Origin of Species" in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioural traits.
Different characteristics tend to exist within any given population as a result of mutation, genetic recombination and other sources of genetic variation.
Evolution occurs when evolutionary processes such as natural selection and genetic drift act on this variation, resulting in certain characteristics becoming more common or rare within a population.
Hence, Modern evolution theory involves Natural selection, Genetic variations and Isolation.