Answer:
Human activities, i.e. anthropogenic actions enhance evolution. For example, excessive or overuse of ODT as a fertiliser in crops resulted in evolution of DDT resistant mosquitoes. When DDT was used first time, many mosquitoes died, but few survived. Survived mosquitoes showed resistance to DDT and reproduced in the presence of DDT. Offsprings produced by these mosquitoes were also resistant to DDT. Hence, DDT is not effective on newly evolved mosquito population.
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