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Evolution. Certain ones of the insect species will have resistance to the insecticide due to mutation and these organisms will survive and reproduce, thus conferring this resistance on to their offspring. The change in allele frequency, the definition of evolution.
bacterial evolution (microevolution)
The development of resistance to antibiotics by bacteria is a real world example of evolution.
Evolution Worlds happened in 2002.
Trials Evolution happened in 360.
GTR Evolution happened in 2008.
Atlantis Evolution happened in 2004.
Evolution Skateboarding happened in 2002.
Dance Evolution happened in 2010.
Buffers Evolution happened in 1999.
resistance
Because adaptations are an observed effect of evolution. They could not happen if evolution did not occur.