Ecosystem

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 3. The organic circulation of ___ from the atmosphere into organisms and back again (11)
  2. 7. A system formed by the interaction of a community of organisms with their physical environment (9)
  3. 8. An individual living thing. (8)
  4. 10. One of the first colonists or settlers in a new territory (7)
  5. 11. How plants make food from sunlight (14)
  6. 14. The number of inhabitants in a given place (10)
  7. 15. The power to do work or make things move (6)

Down

  1. 1. A following of one thing after another in time (10)
  2. 2. A person who uses goods or services (plural) (9)
  3. 4. The metabolic processes whereby certain organisms obtain energy from organic molecules (11)
  4. 5. A community of organisms where each member is eaten in turn by another member (9)
  5. 6. A community of organisms where there are several interrelated ___ chains (7)
  6. 9. The natural world around us (11)
  7. 11. Someone who manufactures something (plural) (9)
  8. 12. The type of environment in which an organism or group normally lives or occurs (7)
  9. 13. The regions of the surface and atmosphere of the Earth where living organisms exist (9)