ecology II

2. colorless and non-flammable gas at normal temperature and pressure
7. the process in which carbon atoms continually travel from the atmosphere to the Earth and then back into the atmosphere
8. a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one
10. shows the continuous movement of water within the Earth and atmosphere
11. the biogeochemical cycle that describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere
12. biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems
14. the part of a system in which some portion of the system's output is used as input for future operations
18. the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water
19. having a lower osmotic pressure than a particular fluid
20. a type of membrane transport that does not require energy to move substances across cell membranes

1. a gas that absorbs and emits radiant energy within the thermal infrared range, causing the greenhouse effect
3. having a higher osmotic pressure than a particular fluid
4. the type of respiration through which cells can break down sugars to generate energy in the absence of oxygen
5. chemical element with the symbol O and atomic number 8
6. long-term heating of Earth's climate system observed since the pre-industrial period
9. the movement of ions or molecules across a cell membrane into a region of higher concentration
13. long-term shifts in temperatures and weather patterns
15. net movement of anything generally from a region of higher concentration to a region of lower concentration
16. same osmotic pressure as some other solution
17. principal molecule for storing and transferring energy in cells