| A | B |
|---|
| a single organism in an environment | individual |
| organisms of the same kind living together | population |
| all the populations of organisms living in an environment | community |
| The community of organisms and its physical factors | ecosystem |
| the place an organism lives within an ecosystem | habitat |
| the certain role of a population in an ecosystem | niche |
| when organisms have limited resources it causes | competition |
| all life depends on | producers |
| organisms that eat other organisms in an ecosystem | consumers |
| mushrooms and bacteria are | decomposers |
| this shows how much energy is passed to the level above | energy pryamid |
| shows the relationship between many food chains | food web |
| shows how consumers in an ecosystem are connected to each other | food chain |
| when the last of a population of organisms dies it becomes | extinct |
| a long relationship between organisms | symbiosis |
| an inherited behavior | instinct |
| a declining population is considered | threatened |
| when a population is about to die out | endangered |
| a behavior developed over time | learned behavior |
| imported or nonnative organisms | exotic |
