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which is created from chrysanthemum flowers are another class of insecticide, usually used by householders to regulate pests similar to leafeating insects and ants. Organophosphates and pyrethroids can connect to soil particles and get washed into rivers and streams, endangering aquatic life. Chemicals that exhibit the characteristics of DDT i.e. excessive toxicity, persistence and bioaccumulation are termed persistent natural pollutants , and a lot of the POPs are pesticides. Pesticides have been discovered to be carcinogenic in experimental animals, and due to this fact are presumably carcinogenic to humans. They are suspected of miserable the immune system, and of disrupting the endocrine system, mimicking or blocking regular hormone exercise Morner , 2002. More on endocrine disruptors is given below. Pesticides are chemicals used to kill pests corresponding to weeds, bugs, fungi and rodents. After the Second World War, pesticides such as DDT – which were highly poisonous, persistent and bioaccumulating – have been commonly used in agriculture and for vector control against the Anopheles mosquito, for malaria control. The populations of birds of prey declined as a result of eggshell thinning stopping the delivery of live offspring. This was due to DDE , a really steady metabolite of DDT . Sexual development and behavior in birds corresponding to gulls was also disturbed .