| A | B |
|---|
| Limiting factors | Those things that keep a population from getting larger, like food or water. |
| Carrying capacity | The largest population that an area can support |
| Depletion of food | Amount of food decreases. If there's not enough food, it leads to competition for resources. If they can't compete, they will not survive. |
| Habitat destruction | Occurs when people take over natural habitats. Trade-offs--humans must assess risks and benefits. Ex: logging-->wood for homes but destroys habitats |
| Disease | Any change (other than injury) that interferes with normal body function. Can spread naturally. Bacteria can become resistant. Chemicals causing it enters because of humans. |
| Natural disasters | Not directly caused by human activity, such as hurricanes or earthquakes. Natural habitats are destroyed. Worse when associated with human activity. |
| Pollution | Harmful change in the chemical makeup of water, soil, or air. Air pollution-damages habitats and harms organisms. Can lead to acid rain. Water pollution--wastes enter lakes, rivers, etc. |
| Acid rain | Form of air pollution caused by the burning of fossil fuels. |
| Ultraviolet radiation | Screened out by the ozone layer. Can kill cells, cause mutations. |
| Urbanization | Increase of the number of people living in cities and towns. Can lead to the destruction of habitats. |
