the use of pesticides on crops has been a common farming practice for decades. what had been the greatest effect of natural selection through the use of pesticides on certain insect populations?

Gay-lussac's law i think.

In some developing nations the percentage of the animal protein from fish in the diet can be as high as 25 percent.  about 85% of fish caught is used for human consumption.  the remainder is converted into fishmeal and fish oil.