Unit 2 Choice Board

4. an organism that eats other plants or animals for energy and nutrients
5. species formed from chemical reactions
9. substance or compound added to a system to cause a chemical reaction
10. the envelope of gases surrounding the earth or another planet.
12. an organism that decomposes organic material
13. responsible for the absorption of light to provide energy for photosynthesis
17. a sequence of reactions in the living organism in which oxidation of acetic acid or acetyl equivalent provides energy for storage in phosphate bonds
18. chemical element with the symbol N and atomic number 7
19. the regions of the surface, atmosphere, and hydrosphere of the earth occupied by living organisms.
20. chemical element with the symbol P and atomic number 15

1. an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur
2. the chemical breakdown of a substance by bacteria
3. all the rocks that make up Earth,
6. all the waters on the earth's surface
7. physical substance in general
8. organic compound that provides energy to drive and support many processes in living cells
11. organic compound in metabolism and is essential to the flow of energy in living cells
14. process used by many cellular organisms to convert light energy into chemical energy
15. chemical element with the symbol C and atomic number 6
16. the breakdown of glucose by enzymes