Ellis Panston Essay

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ELLIS PANKSTON 1. Ecosystem—A specific biological community and its physical environment interacting in an exchange of matter and energy. 2. Abiotic factors—these are the nonliving factors of an ecosystem, such as rocks, soil, rivers 3. Food chain—food chains and food webs are representations of the predator-prey relationships between species within an ecosystem or habitat. 4. Food webs—a complex, interlocking series of individual food chains in an ecosystem. 5. Pyramid of production- 6. Water cycle—the recycling and reutilization of water on earth, including atmospheric, surface, and underground phases and biological and nonbiological components. 7. Carbon cycle—the circulation and reutilization of carbon atoms, especially via the process of photosynthesis and respiration. 8. Nitrogen cycle—the circulation and reutilization of nitrogen in both inorganic and organic phases. 9. Phosphorus cycle—the movement of phosphorus atoms from rocks through the biosphere and hydrosphere and back to rocks. 10. Negative feedback—factors that result from a process and, in turn, reduce the same process. 11. Positive feedback—factors that result from a process and, in turn, increase the same process. 12. Dampening effect—in physics, damping is any effect that tends to reduce the amplitude of oscillations in an oscillatory system, particularly the harmonic oscillator. 13. Eutrophication-- is an increase in the concentration of chemical nutrients in an ecosystem to an extent that increases the primary productivity of the ecosystem. 14. Homeostasis—a dynamic, steady state in a living system maintained through opposing, compensating adjustments. 15. Natural systems-fixed and determined by nature: pertaining to the constitution of a thing; belonging to the native character. 16. Trace elements—are used to describe a range of

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