Refer to the equations shown. A starting population has 150 animals.During the year, 50 animals are born and 30 die.Ten animals immigrate into the population, and 5 emigrate.Which represents the change in population size at the end of the year?
A) r = 0.13
B) r = 0.33
C) ∆N = 20
D) ∆N = 25
E) ∆N = 50

Question

Refer to the equations shown.  A starting population has 150 animals.During the year, 50 animals are born and 30 die.Ten animals immigrate into the population, and 5 emigrate.Which represents the change in population size at the end of the year?
A) r = 0.13 
B) r = 0.33 
C) ∆N = 20 
D) ∆N = 25 
E) ∆N = 50

Quizplus · Accepted Answer

The change in population size (∆N) can be calculated using the following equation:
∆N = (births + immigrants) - (deaths + emigrants)
Substituting the given values:
∆N = (50 + 10) - (30 + 5)
∆N = 25
Therefore, the correct choice is D, ∆N = 25.

Refer to the Equations Shown