Darwin proposed that new species evolve from ancestral forms by Punjab PMET 2005, JPMER 2012 (a)...

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Darwin proposed that new species evolve from ancestral forms by
Punjab PMET 2005, JPMER 2012
(a) the gradual accumulation of adaptations to changing environment
(b) the inheritance of acquired adaptation to the environment
(c) the struggle for limited resources
(d) the accumulation of mutations
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