Question 10 of 387

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