| bushes and trees that shed their leaves at the end of a growing season |
| a natural arrangement of living organisms interacting within their physical environment to create a stable system |
| in danger of extinction throughout (all or a significant portion of) its range if current trends affecting its population continue |
| the external surroundings in which an organism lives |
| a state of balance between opposing forces or influences |
| changes in organisms through successive generations that allow new species to develop |
| over use of a natural resource for one's own profit or advantage |
| the loss of an entire species so there are no living members |
| the total number of genes or genetic information possessed by all the reproductive members of a species |
| a direct descendent from an ancestor; ancestry |
| the functional position of an organism in its environment |
| a group of organisms that closely resembles one another, that breeds under natural conditions, and produces fertile offspring |
| any species likely to become endangered in all or a significant portion of its range |
