Birth rate means the number of births per thousand persons in a particular year and at a particular area.
Death rate means the number of deaths per thousand persons in a particular year and at a particular area.
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The population decreases when the death rate is higher than the birthrate.
Consecutive numbers, by definition, don't differ by 17. It would have to be something like consecutive square numbers (64 and 81).
1830
One option is the word birthrate.
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