2.3 Flashcards
What are the three main factors of population growth rates?
Sex ratios, generation time, and age structure.
Explain what generation time is and what it means.
Generation time is how long it takes for an individual to reproduce. To get a better growth rate, a shorter generation time would be ideal.
What is a sex ratios?
The number of males compared to the number of females.
What happens in stage 1 of demographic transition?
Birth rate and death rate are both high and the population is beginning to rise.
How is a population age structure diagram crafted?
On one side is female and the other side is males. The different levels indicate different age ranges, and they go up as you ascend up the chart. The amount of people, whether that be a percent or number, is determined by the length of the line.
What are some concerns with population growth?
lack of resources, more fossil fuels, and a higher chance for invasive species.
Where does the birth rate go during stage 5?
It can go up or down.
