Ecology part 2

6. the series of processes by which nitrogen and its compounds are interconverted in the environment and in living organisms, including nitrogen fixation and decomposition.
8. long-term shifts in temperatures and weather patterns.
11. A chemical process in which oxygen is used to make energy from carbohydrates (sugars).
12. the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.
13. a biological occurrence wherein the output of a system amplifies the system (positive feedback) or inhibits the system (negative feedback).
16. the type of respiration through which cells can break down sugars to generate energy in the absence of oxygen.
18. any external solution that has a high solute concentration and low water concentration compared to body fluids.
19. the process by which organisms combine oxygen with foodstuff molecules, diverting the chemical energy in these substances into life-sustaining activities and discarding, as waste products, carbon dioxide and water.
20. the process in which carbon atoms continually travel from the atmosphere to the Earth and then back into the atmosphere.

1. the membrane found in all cells that separates the interior of the cell from the outside environment.
2. a waste product made by the body.
3. a type of cellular transport in which substances such as ions and molecules move down their respective concentration gradients.
4. the net passive movement of molecules or particles from regions of higher to regions of lower concentration.
5. a chemical compound made up of a carbon atom and two oxygen atoms.
7. A type of sugar; the chief source of energy for living organisms.
9. a kind of cellular transport where substances move against a concentration gradient.
10. any external solution that has the same solute concentration and water concentration compared to body fluids.
14. the continuous movement of water within the Earth and atmosphere.
15. the net movement of water across a semipermeable membrane.
17. circulation of phosphorus in various forms through nature.