Prior to the beginning of the twentieth century,the primary cause of death in human populations was:

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Before the 20th century, infectious diseases were the leading cause of death worldwide. This was due to poor hygiene, crowding, and lack of adequate medical care. Infant mortality was also high, but it was largely a consequence of the prevalent infectious diseases. Cancer and heart disease became major causes of death in the later part of the 20th century.

Prior to the Beginning of the Twentieth Century,the Primary Cause