Which two components make up the population growth rate?

Which two components make up the population growth rate?

• A. Birth rate and death rate
• B. Net migration rate and natural increase rate
• C. Immigration rate and emigration rate
• D. Ground water and pollution levels

Answer: (B)

Population growth rate shows how a population changes over time due to three forces: births, deaths, and movement of people. It combines natural increase and net migration. Natural increase is simply births minus deaths, while net migration is the number of people moving in minus those moving out. When you add natural increase to net migration, you get the overall growth rate (often expressed per 1,000 people). For example, if births exceed deaths by 4 per 1,000 and net migration adds 2 per 1,000, the population grows by 6 per 1,000. Groundwater and pollution levels aren’t direct determinants of population size, so they don’t factor into the population growth rate.

Population growth rate shows how a population changes over time due to three forces: births, deaths, and movement of people. It combines natural increase and net migration. Natural increase is simply births minus deaths, while net migration is the number of people moving in minus those moving out. When you add natural increase to net migration, you get the overall growth rate (often expressed per 1,000 people). For example, if births exceed deaths by 4 per 1,000 and net migration adds 2 per 1,000, the population grows by 6 per 1,000. Groundwater and pollution levels aren’t direct determinants of population size, so they don’t factor into the population growth rate.