zoological knowledge and theories are to maintain health & to control the epidemic diseases . but still there is some dangerous medical problems which need further study , for example , control & cure of cancer & cardiovascular diseases .Protozoans and helminths are responsible for causing many diseases .the control & cure of these diseases are studied by economic zoologists.The process of medical technology is intimately connected with the application of drugs on animals. similarly the drugs for diphtheria,typhoid &other diseases were found only after tiresome experiments on animals. Without theses animals it would have been impossible to discover the medicines for several human diseases.
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