Fungicides are chemical agents used by farmers to control fungal pathogens that damage agricultural crops.

Name the kingdom of organisms targeted by fungicides.

Name the kingdom of organisms that naturally produce antifungal compounds, such as phytoalexins or chitinases, to defend against these pathogens.

Over time, a specific fungicide may become ineffective at controlling a population of fungal pathogens. Use your knowledge of natural selection to explain why.