| A | B |
|---|
| Limiting Factor | Anything that controls the growth or survival of a population |
| the number of prey living in the ecosystem | the number of predators an ecosystem can support is determined by what |
| growth | a population's size can limit its . . .? |
| adaptations | special characteristics developed by plants to help them survive |
| parasites | organisms that live on or in other organisms |
| hosts | parasites feed on . . . ? |
| Ice Ages | the time period when huge ice sheets covered the land |
| breathing | you change the environment about 15 times a minute by . . . ? |
