click below
click below
Normal Size Small Size show me how
PSSA VOCAB UNIT 6
PSSA Vocab Unit 6
Term | Definition |
---|---|
Evolution | A process of change that explains why what we see today is different from what existed in the past; it includes, earth and life on earth. Biological evolution is a change in hereditary characteristics of groups of organisms over the course of generations. |
Extinction | The complete elimination of a species on earth. |
Endangered species | A species that is in danger of extinction throughout all or a significant portion of its range. |
Equilibrium | The ability of an ecosystem to maintain stability among its biological resources (e.g., forest, fisheries, crops) so that there is a steady optimum yield. |
Sustainability | The ability to keep in existence or maintain. A sustainable ecosystem is one that can be maintained. |
Succession | The series of changes that occur in an ecosystem with the passing of time. |