| A | B |
|---|
| Environment | everything that surrounds and affects a living thing |
| Ecology | the study of how living and nonliving things affect each other |
| Ecologist | scientists who study ecology |
| Ecosystem | a group of living things and their nonliving environment |
| Community | all the plants and animals that live and interact with each other in a place |
| Population | a group of the same kind of living thing in a community |
| Habitat | the special place within a community where a plant or animal lives |
| Predator | an animal that hunts another animal for food |
| Prey | an animal that is hunted |
| Niche | th role that each living thing plays in a habitat |
| Birth rate | the number of animals that are born in a period of time |
| Death rate | the number of animals that die in a period of time |
| Succession | a series of changes in the community of an ecosystem |
| Pioneer stage | the first stage of succession |
| Climax stage | the last stage of succession |
| As the birth rate increases | population goes up |
| As the death rate increases | population goes down |
| Population is affected by | Disease, lack of food, natural disaster |
