ek 7 ib ess
Terms in this set (13)
1st law of thermodynamics
Energy cannot be created or destroyed
2nd law of thermodynamics
Energy cannot be changed from one form to another without a loss of usable energy
A community of living organisms of a single major ecological region.
Negative Feedback Mechanisms
The most common homeostatic control mechanism. The net effect is that the output of the system shuts off the original stimulus or reduces its intensity. (ex: heating system, prey and predators)
positive feedback mechanism
increase the original signal and push in further; (ex: childbirth and blood clotting)
A community of organisms where there are several interrelated food chains
Gross Productivity (primary + secondary)
Net Productivity (primary + secondary)
A relationship between two species in which both species benefit
a system in which matter and energy exchanges do not occur across boundaries
matter can enter from or escape to the surroundings
A system that can exchange neither energy nor matter with its surroundings.
the distribution of plants or animals into specific zones according to such parameters as altitude or depth, each characterized by its dominant species.