A farmer sprays insecticide on his crops to kill unwanteed insects. Most of the insects die, and the chemicals have the effect of damaging the DNA of the insects that are not killed.What of these happened?
A- sexual selection among rthe insects has changeds the gene pool
B-genetic equlibrium has been maintained
C- Mutations have arisen that may have alteresd allele frequescies
D-Indidviduals with new genes have immigrated into the population.