Over time, pesticides become less effective. This is because . Question 14 options: pests can evolve defenses against pesticides over time, federal regulations require that lower-strength pesticides be used transgenic crops have been introduced over time, farmers decrease the amount of application due to the high cost of product

pests can evolve defenses against pesticides over time

Explanation:

Pesticides are chemicals employed to kill pests generally. With continuous and indiscriminate use of pesticides, they become less effective because pests population often evolve a defense mechanism against them.

With each usage, more and more pest population survive. Those that survive gradually multiply and pass the survival gene to their offspring eventually giving rise to a population that is genetically insusceptible to the effects of the pesticide. This is generally referred to as evolution by natural selection.