Population dynamics are the ways through which population changes over time. At a global level,

which of the following sets of factors are the ones we need to consider in order to predict future

population?

a$.$ Population at a previous time period, births since that time period, deaths since that time

period

b$.$ Population at a previous time period, immigrants since that time period, emigrants since that

time period

c$.$ Population at a previous time period, births since that time period, deaths since that time

period, immigrants since that time period, emigrants since that time period

d$.$ Population today, projected births for the next year, projected deaths for the next year

e$.$ None of the above