| A | B |
|---|
| individual. | A single organism in an environment. |
| population. | Are all the individuals of the same kind living in the same environment. |
| community. | all the populations of organisms living together in an environment. |
| ecosystem. | Is a community and its physical environment together. |
| habitat. | Is a place in an ecosystem where a population lives. |
| niche. | Is the role each population has in its habitat. |
| producers. | Is an organism that makes its own food. |
| consumers. | Is an organism in a community that must eat to get the energy it needs. |
| food chain. | Is the way in which the organisms in an ecosystem interact with one another according to what they eat. |
| decomposers. | Is a consumer that breaks down the tissues of dead organisms. |
| food web. | It shows the interactions among many different food chains in a single ecosystem |
| energy pyramid. | It shows the amount of energy available to pass from one level of a food chain to the next |
| competition. | Is the contest among organisms for the limited resources of an ecosystem. |
| symbiosis. | Is a long-term relationship between diferent kinds of organisms. |
| instinct. | Is a behavior that an organism inherits. |
| learned behaviors. | Is a behavior that an animal learns from his parents. |
| exotic. | Is an imported or nonnative organisms. |
| extinct. | Is no longer in existence;describes a species when the last individual of a population dies and that organism is gone forever. |
| endangered. | Is a term describing a population of organisms that is likely to become extinct if steps are not taken to save it. |
| threatened. | It describes a population of organisms that are likely to become endangered if they are not protected. |
