Question

The graph attached shows the brith rate, death rate, and net migration rate for Egypt over the past 20 years. Need help with question A. Thanks.

Answer 1

Growth rate (r) in ecology is given by the substraction of the death rate from the birth rate. Therefore, the annual growth rates (per 1,000 people) for the years 1990 and 2010 are,

1999: r = 31 - 9 = 22

2010: r = 25 - 5 = 20

If you want to calculate r per habitant, which is the form most used in ecology modelling, you should divide the previous answers by 1,000:

1999: r = 0.022

2010: r = 0.02