| A | B |
|---|
| renewable resources | resources that are naturally replaced in a human's lifetime |
| nonrenewable resources | resources that cannot be replaced naturally in a human's lifetime |
| pollution | substance introduced into the ecosystem that has a negative effect on living things |
| conservation | wise use of resources that provides a way for them to also be used by future generations |
| preservation | non-use of resources to let nature take its course with the ecosystem |
| clear cut forestry | logging in which all trees are cut and then the area is replanted |
| selective cut forestry | logging where only certain tree species or ages of trees are cut, leaving the others to mature |
| fishery | a large area with a valuable source of ocean organisms |
| aquaculture | practice of raising fish and other water dwelling organisms in artificial ponds or pens |
| biodiversity | the number of different species living in an area |
| keystone species | a species that influences the survival of many other species in the ecosystem |
| extinction | when all the members of a species have died |
| endangered species | a species with low numbers and possibly headed for extinction in the near future |
| threatened species | a species with numbers below normal levels and possibly becoming endangered in the near future |
| habitat destruction | total loss of habitat |
| habitat fragmentation | reduction and separation of suitable habitat for an organism |
| captive breeding | reproducing species in zoos or wildlife preserves |
| niche | an organism's occupation in the ecosystem |
| habitat | an organism's address in the ecosystem |
| recycling | a practice that allows a resource to be used more than once |
