Which of the following has evolved mainly as a result of artificial selection? (a) darker colour...

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Which of the following has evolved mainly as a result of artificial selection?
(a) darker colouring of the peppered moth near industrial areas
(b) increased production of antibiotics by the fungus Penicillium sp.
(c) increased resistance of houseflies to the insecticide DDT
(d) increased tolerance of lichens to heavy metals on tree bark around mine workings
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