Chapter 3: The Biosphere

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Across
  1. 3. Greek root of the word economics
  2. 6. Nitrogen ____ has nitrogen fixation and denitrification
  3. 9. Group of ecosystems with similar climates and organisms
  4. 11. Animal that consumes both plants and other animals
  5. 12. ___ cycle that includes precipitation, transpiration, and more.
  6. 13. Ecological pyramid that shows the relative number of organisms in each trophic level
  7. 15. Cycles through which elements pass from one organism to another
  8. 18. An abiotic ___ can be sunlight, heat, rain, etc.
  9. 19. The study of interactions between organisms and their environment
  10. 20. Floating algae
  11. 23. Chemical substances that organisms need to live
  12. 24. All life on earth
Down
  1. 1. Total amount of living tissue within a given trophic level
  2. 2. Another name for heterotroph
  3. 4. A series of steps in which energy is transferred through organisms
  4. 5. 3-D shape that shows the relative amount of energy or matter within each trophic level
  5. 6. Autotrophs complete either photosynthesis or _____
  6. 7. Method used by ecologists to study organisms and ecosystems
  7. 8. ____ cycle that includes cellular respiration and the burning of forests and fossil fuels
  8. 10. Nutrient that limits productivity
  9. 14. A ____ factor is a biological influence on organisms
  10. 16. A step in a food web or chain
  11. 17. Made up of many food chains
  12. 21. Another name for primary producers
  13. 22. First level of organization in our planet