Multiple Choice
In population demography, what term describes the number of individuals per unit area or volume?
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50. Population Ecology
Population Demography
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In population demography, which equation correctly describes change in human population size over a time interval (ignoring age structure)?
A
B
C
D
Verified step by step guidance1
Understand that the change in population size (\( \Delta N \)) over a time interval depends on four main factors: births (\( B \)), immigration (\( I \)), deaths (\( D \)), and emigration (\( E \)).
Recognize that births and immigration add individuals to the population, so they contribute positively to \( \Delta N \).
Recognize that deaths and emigration remove individuals from the population, so they contribute negatively to \( \Delta N \).
Combine these factors into a single equation that expresses the net change in population size as the sum of additions minus the sum of subtractions:
\[ \Delta N = (B + I) - (D + E) \]
This equation assumes no age structure and provides a straightforward way to calculate how the population size changes over time.
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