1. Populations
Chapter 5

2. Characteristics of Populations
Vocabulary Population density
There are several terms that can be used to describe a population in nature.
Geographic distribution
It describes the area inhabited by the population.
Population Density
It is the number of individuals per unit area
534 trees/Km2
Growth rate
How fast a population grows
Population’s age structure
It looks at the average age of the population.

3. Which Population is more Dense?

4. Population’s age structure
Figure 5-13 Age Distribution
Population’s age structure
Section 5-3
U.S. Population
Rwandan Population
Males
Females
Males
Females
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5. Population Growth Vocabulary
Immigration
Emigration
Three factors can affect the population size:
Number of births
Number of deaths
Number of individuals that enter or leave the population
Immigration is the movement of individuals into a population. It increases the population.
Emigration is the movement of individuals out of a population. It decreases the population