Answer :

Final answer:

Ernst Ravenstein's demographic studies focus on population changes over time, including birth rates, death rates, and life expectancies.

Explanation:

Ernst Ravenstein's demographic studies primarily focus on various aspects of population changes over time, including birth rates, death rates, and life expectancies. Demography is the statistical study of these population dynamics, and it provides insights into the growth patterns and trends of human populations. Ravenstein's research contributes to our understanding of how populations change and the impact of these changes on societies.

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