Which one of the following sequences was proposed by Darwin and Wallace for organic evolution? a...

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Which one of the following sequences was proposed by Darwin and Wallace for organic evolution?
a. Overproduction, variations, constancy of population size, natural selection
b. Variations, constancy of population size, overproduction, natural selection
c. Overproduction, constancy of population size, variations, natural selection
d. Variations, natural selection, overproduction, constancy of population size
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