More babies, more members of the population.
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The birth rate affects the size of population because of what its like. And the death rate is more than you can imagine.
The population size also depends on migration, for which there is no information provided.
qualitative
I understand by birth and death rate is that it is a statistic kept by National Government, county and local councils to enable forward planning. It should be an indicator of where resources are best used to the advantage of society, as a whole.
The birth rate is the number of children born in a year as a share of total population. Birth rates have important short and long-term effects. Essentially, a higher birth rate will increase the population in the short-term simply because more children are born. More importantly, it will increase population in the long-run because there will be more children in a generation, and when those children grow up there will be more people who are having children, resulting in exponential population growth.