Answer:
Some individual insects are more likely than others to survive and reproduce due to their inherited traits
Explanation:
One of the major challenges that farmers face in insect pest control and management of present, is the increase in pesticide resistance that most insect pests have built up over time with the increase in the quantity used.
Over time some members of a population of insects that possess desirable traits that make them withstand the effects of chemicals and traits that increase their reproduction rate become selected against other members that have traits that make them unfit to survive.
With time, the individuals with traits that make them fit to survive, produce more offspring with desirable traits than those individuals with traits that make them vulnerable and unfit. Members with inherited traits that increase resistance and survival, become more common in the population of that specific insect.
<em>This explains why higher concentrations of a particular pesticide have been required each ear over the past ten years to effectively eradicate same specific insect pest</em>.