The document discusses population biology concepts. It notes that during a demographic transition from high to low birth and death rates, countries often experience rapid population growth. This is because as death rates decline due to improved sanitation and medicine, birth rates remain high, at least initially, resulting in a period of high population increase.

1. Populations Biology ~ Michael Edgar

18. Nigeria Sweden

19. Nigeria Sweden

20. Nigeria Sweden

22. Plant Growth = 400 Plant Growth = 100

24. Wolves Added Plant Growth = 200 Plant Growth = 400