A) natural selection
B) induced mutation
C) reproductive isolation
D) genetic drift
Correct Answer: A
Solution :
According to natural selection theory of Darwin ?every organism has the potentiality to produce more offsprings but only those individuals which posses superior physical, behavioural or other attributes are more like to survive than those that are not so well endowed?. Thus, natural selection in some bacteria helps them to survive in streptomycin containing medium.
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