Вопрос № 236646 - Английский язык

Установите последовательность пропущенных в тексте слов.
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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The environment has always been changing rapidly.

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Diseases of food animals are the focus of veterinary scientists.

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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.