unit 4

3. a plastid that contains chlorophyll and in which photosynthesis takes place
4. Respiration without oxygen
5. relating to or resulting from living things, especially in their ecological relations
6. the process of burning something
11. a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms
12. the envelope of gases surrounding the earth or another planet.
15. releases more carbon than it absorbs
16. the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms
18. physical rather than biological; not derived from living organisms.abiotic chemical reactions
19. the action of breathing
20. power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines

1. the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water.
2. a green pigment, present in all green plants and in cyanobacteria, responsible for the absorption of light to provide energy for photosynthesis.
7. the process by which organisms combine oxygen with foodstuff molecules, diverting
8. the rigid outer part of the earth, consisting of the crust and upper mantle
9. an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur
10. the chemical element of atomic number 6, a nonmetal which has two main forms
13. any of the almost spherical concentric regions of matter that make up the earth and its atmosphere, as the lithosphere and hydrosphere.
14. all the waters on the earth's surface, such as lakes and seas, and sometimes including water over the earth's surface, such as clouds
17. physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.