Something I really enjoyed learning so far this semester is about population. Three important characteristics of a population are its geographic distribution, density, and growth rate. Population density is the number of individuals per unit area. Three factors that can affect the population size are the number of births, the number of deaths, and the number of individuals that enter or leave the population. Under ideal conditions with unlimited resources, a population will grow exponentially. As resources become less available, the growth of a population slows or stops. Exponential growth occurs when the individuals in a population reproduce at a constant rate. Logistic growth occurs when a population's growth slows or stops following a period or exponential growth. Like the populations of many other living organisms, the size of the human population tends to increase with time. Birthrates, death rates, and the age structure of a population help predict why some countries have high growth rates while other countries grow more slowly.
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