Вопрос № 236647 - Английский язык

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The foremost task of veterinary scientists and experts is the organization and carrying out of complex investigations on the problems which are of great importance for the development of animal husbandry. They also must help collective farms apply the achievements of science and advanced experience in their practical work. Veterinary service should pay particular attention to the organization of veterinary work on industrial livestock and poultry farms to prevent the spreading of infectious diseases. At present due to the tremendous labour of thousands of veterinary scientists and practitioners the veterinary-sanitary status of cattle-breeding has been improved, mortality has reduced, occurrence of infectious and non-infectious diseases has lowered.
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What must veterinary scientists and experts help collective farms?

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Diseases tend to spread more rapidly among hogs, 1_______, and other livestock that are kept in confined areas. Young animals also tend to become infected easily. Scientists conduct many research programs to 2_______ new ways of combating livestock diseases. These experts work to identify and eliminate the organisms that spread such diseases as salmonella and 3_______. Identification of specific genes that produce resistance to diseases can also lead to 4_______ animals.

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Dinosaurs were replaced by mammals and most recently by humans.

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The identification of a disease-causing micro-organism enables the veterinarian to choose the best drug for therapy.

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Protozoans were considered to be animals because they move and don’t photosynthesize.

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Some kinds of fish can cause nervous disturbances.