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I don't know if this is just me, but I'd consider this a pretty badly worded question. For models of population dynamics, the rate at which the size of a population changes over time is normally accepted to be the net balance of four fundamental processes: Birth, Immigration, Death, and Emigration ('BIDE'; see for example here). Birth and immigration ...


I feel answers A & C are more obvious. option D is countered by Birthrate. also, migration is a temporary affair, check its meaning (An instance of moving to live in another place for a while). whereas emigration is to permanently move to a new location and populate that area.


Here is a partial answer that also expands upon a previous comment: Between 1900 and 2013, 20,000 English surnames had gone extinct according to the Daily Mail's summary of research on surnames. This is a partial answer because it only tells us how many names are gone and is from the wrong time period. To completely answer your question, I suspect you ...

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