Multiple Choice
Which three demographic factors directly affect the size of a population?
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50. Population Ecology
Population Demography
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What happens to the density of a population as a result of mortality and emigration?
A
It decreases
B
It increases
C
It remains unchanged
D
It fluctuates unpredictably
Verified step by step guidance1
Understand the concept of population density: Population density refers to the number of individuals per unit area or volume in a given habitat.
Define mortality: Mortality is the death rate within a population, which directly reduces the number of individuals in the population.
Define emigration: Emigration is the movement of individuals out of a population, which also decreases the number of individuals in the population.
Analyze the combined effects of mortality and emigration: Both processes result in a reduction in the number of individuals within the population, leading to a decrease in population density.
Conclude that the correct answer is 'It decreases,' as both mortality and emigration reduce the population density.
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