Organisms and their environment.

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Across
  1. 3. Chemicals used to kill weeds, which compete with crops for resources like water and nutrients
  2. 6. A network of interconnected food chains.
  3. 7. The buildup of a substance, often a pollutant, within an organism over time.
  4. 10. Energy-rich resources formed from the remains of ancient plants and animals over millions of years.
  5. 11. A position of an organism in a food chain, food web or ecological pyramid.
  6. 13. An organism that makes its own organic nutrients, usually using energy from sunlight, through photosynthesis.
  7. 14. An animal that gets its energy by eating other animals.
Down
  1. 1. An organism that gets its energy from dead or waste organic material.
  2. 2. Graphical representation of the total mass of living organisms at each trophic level in an ecosystem.
  3. 4. The clearing of trees on a large scale, usually to provide land for agriculture or development.
  4. 5. Graph that shows the transfer of energy from one organism to the next, beginning with a producer.
  5. 8. An organism that gets its energy by feeding on other organisms.
  6. 9. An animal that gets its energy by eating plants.
  7. 12. Principal source of energy input to biological systems.
  8. 13. Process by which plants, algae, and some bacteria convert light energy into chemical energy, using carbon dioxide and water to produce glucose (a sugar) and oxygen.