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Grade 5 B-2 Sci. Def
Chapter 2 Living Things Interact
Term | Definition |
---|---|
individual | A single organism in an environment |
population | All the individuals of the same kind living in the same environment |
community | All the populations of organisms living together in an environment |
ecosystem | A community and its physical environment together |
habitat | A place in an ecosystem where a population lives |
niche | The role each population has in its habitat |
producer | Organisms that make their own food |
consumer | An organism in a community that must eat to get the energy it needs |
food chain | The ways in which the organisms in an ecosystem interact with one another according to what they eat |
decomposer | Consumers that break down the tissues of dead organisms |
food web | Shows the interactions among many different food chains in a single ecosystem |
energy pyramid | Shows the amount of energy available to pass from one level of a food chain to the next |
competition | The contest among organisms for the limited resources of an ecosystem |
symbiosis | A long-term relationship between different kinds of organisms |
instinct | A behavior that an organism inherits |
learned behavior | A behavior an animal learns from its parents |
exotic | An imported or nonnative organism |
extinct | No longer in existence; the result when the last individual of a population dies and that organism is gone forever |
endangered | A population of organisms that is likely to become extinct if steps are not taken to save it |
threatened | Describes a population of organisms that are likely to become endangered if they are not protected |