Until the past century,which of the following factors contributed greatly to the high mortality rate for young children?

Question

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Infectious diseases such as measles, polio, whooping cough, tuberculosis, and diarrhea were major contributors to the high mortality rate for young children before the development of vaccines, antibiotics, and improved sanitation practices. Lack of micronutrients and malnourishment can also contribute to mortality, but infectious diseases were the leading cause of death. Accidents and injuries are a relatively minor contributor to childhood mortality compared to infectious diseases.

Until the Past Century,which of the Following Factors Contributed Greatly