| A | B |
|---|
| If limited resources reduce the population of rabbits, the populatio of their predators will... | decrease |
| As yeast use up sugar, they change their environment by produing alcohol, making the environment more suitable for bacteria. This is an example of... | succession |
| Secondary succession occurs faster than primary succession because... | seeds are present and soils are fertile |
| In human population, do natural mechanisms regulate population density? | not as mduch as in animal populations because humans manipulate the environment, produce food, prevent disease |
| What are some factors that make a weed, such as a dandelion, successful? | a long tap root to obtain nutrients and survive droughts; numerous seeds, adapted for wind despersal |
| popullation | environmental change in the structure of an ecological community |
| succession | a gradual change in the structure of an ecological community |
| biotic potential | the highest rate of reproduction under ideal conditions |
| acid rain | forms when nitrogen and sulfur oxides dissolve in water vapor |
| carrying capacity | the largest number of individuals an environment can support |
| climax community | a stable, mature community |
| Animals may stop reproducing when... | they expereince crowding |
| pioneer species... | are generally hardy |
| diversity increases when... | organisms change the environment during the process of succession. |
| DDT causes thin eggshells in top carnivore birds because... | DDT levels become increasingly concentrated at each trophic level. |
| Efficient burning of fossil fuels results in... | carbon dioxide and water |
| The aftermath of the fires at Yellowstone provide an example of... | secondary succession |
| Pollution in lakes, rivers, and underground wells causes a serious problem because... | human and other organisms depend on water from these sources, it easily enters the food chain through aquatic organisms, and aquatic organisms tend to concentrate pollutants that cannot be brken down. |
