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Chapter 9
| Question | Answer |
|---|---|
| Biosphere | The parts of earth and the surrounding atmosphere where there is life |
| Community | All the populations of different species that live together in the same area at the same time |
| Population | All the organisms of the same species that live in the same area at the same time |
| Competition | The demand for resources, such as food, water, and shelter, in short supply in a community |
| Limiting factor | Anything that restricts the size of a population |
| Population density | Is the size of a population compared to the amount of space available |
| Biotic potential | The potential growth of a population if it could grow in perfect conditions with no limiting factors |
| Carrying capacity | The largest number of individuals of one species that an environment can support |
| Birthrate | A population’s _________ is the number of offspring produced over a given time period |
| Death rate | The number of individuals that die over the same time period |
| Extinct species | A species that has died out and no individuals left |
| Endangered species | A species whose population is at risk of extinction |
| Threatened species | A species at risk, but not yet endangered |
| Migration | The instinctive seasonal movement of a population of organisms from one place to another |
| Habitat | The place within an ecosystem where an organism lives |
| Niche | _____ is what a species does in its habitat to survive |
| Producer | Organisms that get energy from the environment, such as sunlight , and make their own food |
| Consumers | Organisms that get energy by eating other organisms |
| Symbiosis | A close, long term relationship between two species that usually involves an exchange of food or energy |
| Mutualism | A symbiotic relationship in which both partners benefit |
| Commensalism | A symbiotic relationship that benefits one species but does not harm or benefit the other |
| Parasitism | A symbiotic relationship that benefits one species and harms the other |
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