Chapt.+15-+Pop.,+Urbanization,+and+Environment

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 * **Ecology**- the study of interaction of living organisms and the natural environment.
 * The show focuses on how each of the characters from different backgrounds interact among each other, and how they react to situations in their environment.
 * **Gemeinschaft** - a type of social organization in which people are closely tied by kinship and tradition.
 * Sheldon, Raj, Howard and Leonard have a tradition where they play the game Halo on Wednesday nights. This is an instance where they are brought together by common interests and make a point of consistently carrying on this tradition.
 * **Migration**- the movement of people into and out of a specific territory
 * An example of migration could be how Raj leaves India and comes to California to study.
 * **Gesellschaft** - a type of social organization in which people come together only on the basis of individual self-interest.
 * Each of the male characters share a common interest in science fiction and comic books, so they enjoy attending Star Trek events and spending time at the comic book store.




 * Fertility-The incidence of childbearing in a country's population. **
 * Although Leonard and Sheldon never actually went through with donating their sperm, they could have raised the fertility rate theoretically speaking.
 * ** Urbanization- The concentration of population into cities. **
 * The characters of the show live in a city, and therefore depict this concept well.
 * ** Gesellschaft- A type of social organization in which people come together only on the basis of individual self-interest. **
 * The first character that comes to mind for this concept is Sheldon because he's known for being self-centered. He once even said that he didn't really consider Leonard as a friend and if it weren't for the fact that he can't afford rent alone, he'd be living alone.
 * ** Ecologically Sustainable Culture- A way of life that meets the needs of the present generation without threatening the environmental legacy of the future generations. **
 * The main characters don't live in such an extraneous way that they're ruining the world for future generations. I'd say that because they're scientists and are inventing useful tools, that they're making the world better for the future.
 * The main characters don't live in such an extraneous way that they're ruining the world for future generations. I'd say that because they're scientists and are inventing useful tools, that they're making the world better for the future.