Demographic Transition Model

1. Parasitism - one organism, known as a parasite, lives in or on the other organism, known as the host, from which it derives nourishment. It is not in the best interest of the parasite to kill the host. 2. Deserts - receive less than 25 centimeters of rain per year; windy. 3. Tundra-permanent frozen layer-permafrost; found north of Taiga and in small patches on the mountain tops called alpine tundra. No trees can live here. During a brief 2 month summer, the top layer thaws, and many plants and lichens grow; averages 25cms of precipitation; however the permafrost layer/melting snow keep the soil moist. 4. Deciduous Forest-typically lose their leaves in the fall or winter. They grow their leaves back in the Spring. Typically found in the eastern USA, south central & Southeastern Canada, southern Africa, and many areas of Asia and Europe. They receive
First law of thermodynamics-Energy is neither created or nor destroyed but it can be transformed. 17. Second law of thermodynamics-states there is no loss of total energy but there is a loss of useful energy. 18. Scientific method-observation, hypothesis formation, hypothesis testing, critical evaluation of results, and publishing of findings. 19. Demographic Transition Model 1. Countries start out with stable population. They have a high birthrate and high death rate (disease & famine). 2. Death rates fall as disease and famine come under control from infrastructure, technology, education, and resources. Rapid population growth occurs. 3. As the country becomes industrialized people desire smaller families and make use of contraceptives. 4. Equilibrium occurs as low birthrate = low death rates. 20. Secondary Succession Primary Succession only occurs in a truly lifeless area where the soil has been destroyed - such as where volcanic lava has just cooled. Secondary Succession - occurs where a community has been cleared by a disturbance that does not destroy the