Cat. 5: Environmental Systems

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Across
  1. 3. creates its own food directly from solar energy through photosynthesis
  2. 7. all the biotic and abiotic things, conditions, and interactions in a defined area
  3. 9. The first organisms to rebuild in ecological succession are called the ________ species
  4. 10. two populations that benefit from one another and often depend on each other for survival
  5. 11. two populations that struggle against each other for the same resources in an ecosystem
  6. 14. classification of organisms by feeding relationships in hierarchal order (no space between words)
  7. 15. ____________ succession is a building process that occurs when there is no preceding organisms or soil
  8. 16. ____________ succession is a rebuilding process that occurs after a disrpution to an ecosystem but leaves SOIL, such as a forest fire
Down
  1. 1. word meaning living
  2. 2. This element is exchanged in the environment through photosynthesis in plants, and respiration in animals
  3. 3. one population captures and feeds on another population
  4. 4. bacteria will fix this element into as usable form for plants to take from soil
  5. 5. breaks down the nutrients in dead organisms for its food
  6. 6. one population benefits from another population without effecting it
  7. 8. the total amount of biological matter in a trophic level or ecosystem
  8. 12. word meaning nonliving
  9. 13. the number of organisms of the same species that live in a defined area and make up the breeding group
  10. 15. one population benefits from another population, often while harming it