2.  6.7 Billion

5.  Geographic distribution  Density  Growth Rate

6.  Geographic distribution- area that is inhabited  Density  Growth Rate

7.  Geographic distribution  Density- number of individuals per unit area  Growth Rate

8.  Geographic distribution  Density- number of individuals per unit area  Growth Rate

9.  Geographic distribution  Density  Growth Rate- how fast the population grows

10. Population size is determined by  Number of births  Number of deaths  Number of individuals that enter or leave the population

11.  Birth rate- how many are born  Baby Boom  Death rate- how many die  Black Plague

12. Birth RateDeath RateOverall Rate

13.  Immigration- movement into area  Emigration- movement out of area  What causes people to immigrate or emigrate?  What causes bears to immigrate or emigrate?

14.  Where are the high birth rates in the world?  Where are the high death rates in the world?  Many developed nations have a negative growth rate. Why?

15. -ability to reproduce quickly -nutrients -space -water

16. Bacteria- divide every 20 minutes one day- 4,720,000,000,000,000,000,000 What is the reproduction rate for a mouse? What is the reproduction rate for a human?

17. When a population reproduces at a constant rate. This occurs only under ideal conditions with unlimited resources.

18. Logistic growth- occurs when a population’s growth slows or stops after exponential growth Why does a population stop growing exponentially?  Birth rate decreases  Death rate increases  Immigration decreases  Emigration increases

19. Carrying capacity- The largest number of individuals that an environment can support

20. Limiting factor- a factor that causes population growth to decrease Competition Predation Parasitism and disease Human disturbances Drought and other climate extremes

21.  Density-dependent limiting factor- depends on the population size  Competition- food, water, space, sunlight  Same species  Different species  Competitive exclusion principle  No two species can occupy the same niche in the same habitat at the same time

22.  Predation predator-prey relationship Parasitism and Disease

23. Density-Independent Factors- affect all populations, regardless of size Unusual weather Natural disasters Seasonal cycles Human activities- damming rivers and clear- cutting forests

24. Demography- the scientific study of human populations Demographic transition- a dramatic change in birth and death rates

25.  1. Birth rates stay same, Death rates decline  2. Birth rates decline, death rates stay low Birth RateDeath RateOverall Rate

26.  Age-Structure Diagram- graph of the numbers of people in different age groups

29.  How many people can the world support?  What are the things that people need to live?  -food  -water  -housing  -jobs

30. Resourcesvs.Population