Question

which of the following would cause a decrease in a populations size?
a. immigration
b. increased natality
c. emigration
d. decreased death rate

Explanation:

Population size decreases when losses exceed gains. Emigration (people leaving the population) is a loss factor, so it reduces population size. Immigration (people entering) and increased natality (births) increase size; decreased death rate also increases size.

Answer:

C. emigration