A population of ground squirrels has an annual per capita birth rate of 0.06 and an annual per capita death rate of 0.02. Calculate an estimate of the number of individuals added to (or lost from)a population of 1,000 individuals in one year.
A) 120 individuals added
B) 40 individuals added
C) 20 individuals added
D) 400 individuals added
E) 20 individuals lost

Question

Quizplus · Accepted Answer

To estimate the number of individuals added or lost, we need to calculate the difference between the number of individuals born and the number of individuals that died. 
The number of individuals born = (0.06 x 1000) = 60
The number of individuals that died = (0.02 x 1000) = 20
Therefore, the estimated number of individuals added is 60-20=40. Therefore, the correct choice is B.

A Population of Ground Squirrels Has an Annual Per Capita